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Must a Jewish King need to consult the Sanhedrin before going to war, and What Does This Mean for War Decisions in the Modern State of Israel?

• 11 min read
Must a Jewish King need to consult the Sanhedrin before going to war, and What Does This Mean for War Decisions in the Modern State of Israel?

The Torah's vision of Jewish leadership is one of the most carefully constructed political systems ever recorded. Power is granted, but never absolutely. Authority is structured, but never unilateral. Even a Jewish king — anointed by a navi, crowned with shemen ha'mishchah, leading a Torah-observant nation — does not have the right to declare war on his own. He must consult the Sanhedrin.

This is not a curiosity of ancient law. It is the structural design that the Rambam codifies in Mishneh Torah and that the gedolei haposkim have invoked for seventy-eight years against the modern Israeli political and military establishment. We set out the halacha below, with sources every reader can verify in published seforim.

I. The Torah's Limitations on a King

The Torah's introduction of Jewish kingship in Devarim 17 is striking in what it immediately restricts:

"שׂוֹם תָּשִׂים עָלֶיךָ מֶלֶךְ אֲשֶׁר יִבְחַר ה' אֱלֹקֶיךָ בּוֹ" — "You shall surely place a king over yourself, whom Hashem your God shall choose" (Devarim 17:15).

The verses that follow constrain the king in ways that no human political institution in the ancient world had ever constrained a sovereign. The king may not accumulate horses (Devarim 17:16). He may not take many wives (17:17). He may not accumulate excess silver and gold (17:17). And most strikingly — he is obligated, on pain of forfeiting his throne, to write a Sefer Torah for himself and read in it all the days of his life, so that his heart should not be lifted above his brothers and so that he does not turn from the mitzvah right or left (17:18–20).

The structure is clear from the outset: the Jewish king is not above the Torah. He is under it. His authority is conditional on his subordination to the Torah's law. The Torah's first move in establishing kingship is to bound the king with the same Torah he is appointed to uphold.

II. The Halacha: The King Must Consult the Sanhedrin

The Rambam codifies the laws of warfare in Mishneh Torah, Hilchos Melachim u'Milchamoseihem perek 5. He distinguishes two categories:

Milchemes Mitzvah (Hilchos Melachim 5:1) — the war against the seven Canaanite nations, the war against Amalek, and l'ezras Yisrael miyad tzar shebah aleihem — assisting Israel against an attacker.

Milchemes Reshus (Hilchos Melachim 5:1) — a discretionary war, including wars to expand borders or for political prestige.

And then, in Hilchos Melachim 5:2, the Rambam rules with unmistakable directness:

"וְאֵין הַמֶּלֶךְ נִלְחָם תְּחִלָּה אֶלָּא מִלְחֶמֶת מִצְוָה. וְאֵיזוֹ הִיא מִלְחֶמֶת מִצְוָה... אֲבָל מִלְחֶמֶת הָרְשׁוּת — אֵינוֹ עוֹשֶׂה אוֹתָהּ אֶלָּא עַל פִּי בֵּית דִּין שֶׁל שִׁבְעִים וְאֶחָד" — "And the king does not initially go to war except a milchemes mitzvah. What is a milchemes mitzvah?… But a milchemes reshus — he does not undertake it except by the word of the court of seventy-one."

This is the codified halacha. No Sanhedrin, no milchemes reshus. The king's authority to wage discretionary war is structurally tied to the consent of the seventy-one elders of the Sanhedrin sitting in the Lishkas HaGazis.

The Rambam goes further. In Hilchos Klei HaMikdash 10:12, he rules that the king consults the Urim v'Tumim before going to war. In Hilchos Melachim perek 1, he lays out the conditions for the appointment of a king — anointing by a navi, recognition by the Sanhedrin, meeting the Torah's requirements for character and conduct.

The Jewish king, even at the height of his power, operates inside a halachic structure where the Torah, the Sanhedrin, and the navi all stand above him. He does not get to declare war on his own.

III. The Tanach Confirms the Pattern

The same structure appears across the Tanach's record of Jewish kingship.

David HaMelech is recorded repeatedly consulting Hashem before military action. In Shmuel I 23:2, when David hears that the Pelishtim are attacking Keilah, his first response is not to mobilize the army but to ask Hashem: "Shall I go and smite these Pelishtim?" In Shmuel II 5:19, before going out against the Pelishtim again, David asks: "Shall I go up against the Pelishtim? Will You give them into my hand?" Both times, the answer comes through the Urim v'Tumim, the channel of divine consultation Hashem established for exactly such moments.

Shaul HaMelech is removed from kingship — "and Hashem said, 'I regret that I have made Shaul king'" (Shmuel I 15:11) — for his failure to fully obey Hashem's command, transmitted through the navi Shmuel, regarding the war against Amalek. Shaul's sin was not military. He won the battle. His sin was the failure to follow the Torah authority that stood above him in the war's framework.

The Torah's pattern is consistent: war is conducted within a halachic framework, under the authority of the navi and the Sanhedrin, subordinate to the Torah itself. Even the king, even in war, even when commanded by Hashem, operates within the structure.

IV. What About Milchemes Mitzvah?

The Rambam rules (Hilchos Melachim 5:1) that for milchemes mitzvah — the war against Amalek, the conquest of Eretz Yisrael, or defense against an attacker — the king does not need to first obtain explicit Sanhedrin approval before going out. The obligation is built into the Torah itself.

But notice what the Rambam does not say. He does not say that milchemes mitzvah can be conducted outside the halachic framework. He does not say that the king can act without consulting Torah authority. He does not say that a non-king, a non-Torah-observant political body, can declare a milchemes mitzvah on its own authority.

The Tanach confirms this. Even Yehoshua, conducting the original milchemes mitzvah of conquering Eretz Yisrael, operated under explicit divine command transmitted by Hashem to Moshe and confirmed at every stage by the structure of the Jewish camp — the Aron HaKodesh, the kohanim, the Mishkan. The conquest of Yericho was not a military strategy. It was a halachic ceremony with military consequences.

The Rambam's exemption for milchemes mitzvah is an exemption from needing prior Sanhedrin approval before each engagement, not an exemption from the broader halachic framework. The framework — Torah authority, the Sanhedrin, the navi, the kohanim — remains operative.

V. The Modern Application: Three Halachic Gaps

The State of Israel, since 1948, has waged at least seven major wars and dozens of smaller military operations. From a halachic perspective, three structural elements are missing:

There is no Jewish king. The Israeli prime minister is an elected official, replaceable every four years by a coalition vote. He is not anointed by a navi. He is not recognized by a Sanhedrin. He does not meet the conditions the Rambam specifies in Hilchos Melachim perek 1 for the appointment of a king. The position of melech Yisrael, as the Rambam codifies it, is structurally empty.

There is no Sanhedrin. The Israeli Supreme Court is not a Sanhedrin. The Knesset is not a Sanhedrin. There is no body of seventy-one judges, ordained through the chain of semicha that ended in the period of the late Tannaim, sitting in the Lishkas HaGazis. The seat from which the Sanhedrin's authority must come does not exist. There is no halachic body that can give the consent the Rambam requires for milchemes reshus.

There are no Urim v'Tumim and no navi. The channels of divine consultation that David HaMelech used in Shmuel I 23 do not currently exist. The kohanim do not wear the Urim v'Tumim. The Beis HaMikdash where the consultation took place is in ruins. The line of nevi'im ended with the closing of the canon. The Torah-prescribed means by which a Jewish king verifies that a war is the will of Hashem are not currently operative.

Each gap is consequential. Together, they mean that the formal halachic conditions for a Torah-authorized war — milchemes mitzvah or milchemes reshus — are not in place under the current State.

VI. The Charedi Position, Documented

The Charedi gedolim of the past century have consistently held that the State's military activity, conducted outside the halachic framework the Rambam codifies, cannot inherit the halachic status of milchama as the Torah defines it. The defense of Jewish life remains a binding mitzvah of pikuach nefesh. The formal halachic category of milchemes mitzvah, with all the implications of that designation, requires conditions that do not exist.

This position is documented across the seforim of the major Charedi poskim:

  • The Chazon Ish, in his halachic writings on Hilchos Eiruvin (Orach Chaim 114) and across Kovetz Igros, framed the halachic obligations of bnei Torah and the proper structure of national defense
  • The Brisker Rav (Rav Yitzchok Zev Soloveitchik zt"l) is recorded in Uvdos V'Hanhagos L'Beis Brisk Vol. 2 (siman 140) and Peninei Rabbeinu HaGriz (p. 148) as holding the position uncompromisingly: the State, lacking proper halachic structure, cannot generate the halachic obligations of a Torah-authorized milchama
  • Rav Elchonon Wasserman Hy"d, in Kovetz Maamarim and Ikvesa D'Meshicha, treated secular Zionism as a movement that substitutes nationalism for Torah and cannot generate authentic halachic obligations on Jews who reject the underlying ideology
  • The Satmar Rav zt"l, in Vayoel Moshe (Maamar Shalosh Shevuos), provided the most systematic treatment of how the State's foundational structure relates to the shalosh shevuos and the halachic framework of Jewish national life

This is not isolated rhetoric. It is the documented position of four generations of gedolei haposkim across Lithuanian, Hungarian, and Sephardic mesoros.

VII. The Chazon Ish to Ben-Gurion — On Exactly This Question

The most famous Charedi articulation came in the meeting of October 20, 1952, between the Chazon Ish, Rav Avraham Yeshaya Karelitz zt"l, and Prime Minister David Ben-Gurion, with Yitzchak Navon as the only third-party witness.

Ben-Gurion was advancing exactly the claim the original question of this article addresses: that the State's wars are halachically valid, that its leadership inherits a kind of national religious authority, and that participation in its military framework is a religious obligation. The Chazon Ish's response, recorded in detail, rejected the framing entirely:

Ben-Gurion: And these young men sitting at the borders, who protect you — is that not a mitzvah?

The Chazon Ish: In the merit of our Torah study, they live, work, and are protected.

The Chazon Ish was not denying the importance of defending Jewish life. He was rejecting Ben-Gurion's implicit framing — that the State's military apparatus, conducted outside Torah authority, was a halachically authorized vehicle of Jewish national life. The defense of Jewish life remains a mitzvah of pikuach nefesh, binding on every Jew. The halachic category of authorized Jewish warfare — with a king, a Sanhedrin, Urim v'Tumim, and Torah leadership — is not what the State is conducting.

This was the gadol hador, speaking to the Prime Minister, in 1952. The position has not changed in seventy-three years because the underlying halacha has not changed in two thousand.

VIII. What This Means in Practice

The popular argument from secular and Religious Zionist publications is that the State's wars carry full halachic authority — that the IDF's military decisions inherit the standing of David HaMelech's wars, that Israeli prime ministers exercise something approaching the authority of a Jewish king, and that participation in the State's military framework is therefore a Torah obligation.

The documented halachic reality is otherwise. No Sanhedrin, no milchemes reshus. No king, no kingly authority. No Urim v'Tumim, no divine consultation in the formal halachic channel. The State's military activity may save Jewish lives — and where it does, it fulfills the universal mitzvah of pikuach nefesh — but it does not inherit the halachic status of Torah-authorized warfare, and it cannot generate the religious obligations that status would entail.

What the Charedi world does instead is what the Torah's framework actually obligates when proper halachic structures are not in place:

Tefillah for the safety of Jewish soldiers. The Charedi world davens for soldiers daily. The bracha of r'feinu in Shemoneh Esrei includes specific kavanos for the wounded. Tehillim are said in Charedi shuls and homes for the safety of fighters and when needed, chas V'Shalom, for the return of any hostages.

Torah learning as national protection. Following Sotah 21a's principle of Torah magna u'matzla, the Charedi world invests itself in the form of national defense the Torah itself prescribes. Yeshivos expand their seder during times of war. Bochurim accept additional kabalos. The framework the Rambam codifies in Hilchos Talmud Torah 6:10 — that Talmidei chachamim are structurally exempt from conscription because the Torah protects them — is invoked precisely in moments like these.

Chesed for soldiers' families. The Charedi chesed network — Yad Sarah, Hatzalah, Zaka, Ezer Mizion, Chai Lifeline, the gemachim, the meal deliveries, the support networks for bereaved families — mobilizes in every war. These are not gestures. These are sustained organizational efforts that have served every Israeli community across every front since 1948.

Refusal to grant halachic legitimacy to the State's framework. The Charedi world declines to treat Israeli prime ministers as kings, the Supreme Court as a Sanhedrin, or the IDF chief of staff as a halachically-authorized military commander. This is not disloyalty to Jewish life. It is fidelity to halacha. The framework will not be granted what the halacha does not give it.

IX. We Await the Real King

Three times each weekday, in the Shemoneh Esrei berachah of Hashiva Shofteinu, every Jew in the world davens:

"הָשִׁיבָה שׁוֹפְטֵינוּ כְּבָרִאשׁוֹנָה, וְיוֹעֲצֵינוּ כְּבַתְּחִלָּה, וְהָסֵר מִמֶּנּוּ יָגוֹן וַאֲנָחָה, וּמְלוֹךְ עָלֵינוּ אַתָּה ה' לְבַדְּךָ" — "Restore our judges as at first, and our advisors as in the beginning. Remove from us sorrow and groaning, and reign over us, You, Hashem, alone."

This is what we are asking for. Not the maintenance of the current structure. Not the continuation of the secular State. The restoration of proper Torah authority — the Sanhedrin, the king from the house of David, the navi, the Urim v'Tumim, the Beis HaMikdash, and the entire halachic framework within which Jewish national life is supposed to be conducted.

Three times a day, every Jew — Charedi and not — asks Hashem for this. The fact that the State of Israel exists does not satisfy the request. The request is for something the State explicitly does not provide. The very wording of the berachah is an admission that what we currently have is not yet what we are davening for.

Until that restoration, the Charedi position holds: the State, as a structure, does not inherit the halachic authority of Torah-authorized Jewish national life. Its military decisions are political decisions, made by political bodies, evaluated under the framework of pikuach nefesh on a case-by-case basis. The seforim are still on the shelf. The Rambam still says what he said. Ein ha'melech yotzei l'milchemes ha'reshus ela al pi beis din shel shivim v'echad — and the institutions that would meet that standard do not currently exist.

We await them. We daven for them. We continue the work — Torah, tefillah, chesed, pikuach nefesh as needed — until they return.

"V'sa'ir l'Tziyon b'rachamim, v'eineinu sirenah Malchuscha b'achavah, Baruch Atah Hashem, hamachzir Shechinaso l'Tziyon" — "And to Tziyon, return in mercy, and may our eyes see Your kingship in compassion. Blessed are You, Hashem, who returns His presence to Tziyon."

Sources

Primary halachic and Talmudic sources

  • Devarim 17:14–20 — the mitzvah of appointing a king and the Torah's limitations on royal power
  • Rambam, Mishneh Torah, Hilchos Melachim u'Milchamoseihem 5:1–2 — the categories of milchemes mitzvah and milchemes reshus; the requirement of the Sanhedrin
  • Rambam, Hilchos Melachim perek 1 — requirements for the appointment of a Jewish king
  • Rambam, Hilchos Melachim perek 7 — exemptions and obligations in war
  • Rambam, Hilchos Klei HaMikdash 10:12 — the king's consultation of the Urim v'Tumim
  • Rambam, Hilchos Talmud Torah 6:10 — Talmidei chachamim exempt from anaga (conscription)
  • Talmud Bavli, Sanhedrin 20b — the Talmudic discussion of the king's powers and limits
  • Talmud Bavli, Sotah 21a — Torah magna u'matzla
  • Mishnah Sotah 8:7 — milchemes mitzvah and milchemes reshus

Tanach sources on Jewish kingship and war

  • Shmuel I 15 — Shaul and Amalek; the consequences of not following Torah authority
  • Shmuel I 23:2 — David asks Hashem before going to Keilah
  • Shmuel II 5:19 — David asks Hashem before fighting the Pelishtim
  • Devarim 20:1–4 — Hashem fights for Klal Yisrael; the framework of Jewish warfare

The documented Charedi halachic position

  • Vayoel Moshe, Rabbi Yoel Teitelbaum (Satmar Rav), Maamar Shalosh Shevuos (Brooklyn, 1959/1961)
  • Kovetz Igros, Chazon Ish, Vol. 1
  • Chazon Ish, Orach Chaim, Hilchos Eiruvin, siman 114
  • Uvdos V'Hanhagos L'Beis Brisk, Vol. 2, siman 140 — the Brisker Rav (Rav Yitzchok Zev Soloveitchik zt"l)
  • Peninei Rabbeinu HaGriz, p. 148
  • Kovetz Maamarim and Ikvesa D'Meshicha, Rabbi Elchonon Wasserman Hy"d
  • Michtavim u'Maamarim, Rabbi Elazar Menachem Man Shach zt"l

The Chazon Ish – Ben-Gurion meeting (October 20, 1952)

  • Yitzchak Navon's recorded account, published in his memoirs
  • World Mizrachi, "The Chazon Ish, Ben-Gurion and Rav Tzvi Yehudah" (March 2023)
  • Yeshiva World News, "70 Yrs Ago Today: What Happened At The Historic Meeting Of The Chazon Ish And Ben-Gurion?" (October 2022)
  • Jewish Action, "Great Minds of the 20th Century" (Rabbi Aharon Feldman) — citing MK Shlomo Lorincz, Digleinu Vol. 2 (110)

Tefillah sources

  • Shemoneh Esrei, Berachah 11 (Hashiva Shofteinu) and Berachah 17 (Retzei)