Not to swear in the name of an idol
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This Mitzvah's Summary
It is forbidden to swear or affirm using the name of any idol.
This mitzvah prohibits invoking the name of an idol as part of an oath, vow, or affirmation. Rambam (Hilchot Avodat Kochavim 5:10) rules that one who swears by the name of an idol transgresses this prohibition, even without direct worship. The Talmud (Sanhedrin 63a) explains that swearing in an idol’s name constitutes a form of acknowledgment of its power, undermining the exclusivity of Hashem’s sovereignty.
Sefer HaChinuch (Mitzvah 86) emphasizes that words themselves carry weight, and invoking false gods corrupts the sanctity of speech, which was given for Torah and truth. Rashi (Ex. 23:13) explains “do not let it be heard” to mean not to cause others to swear by it or even mention it in a way that dignifies it. Ramban broadens the mitzvah to include any act that legitimizes an idol, even indirectly. Midrash (Sifrei Devarim 61) sees this mitzvah as part of removing idolatry not only from practice but also from thought and language.
Commentary & Classical Explanation:
- Rambam (Avodat Kochavim 5:10): Even swearing without worship violates the prohibition.
- Sefer HaChinuch (86): Protects sanctity of speech from idolatrous corruption.
- Talmud (Sanhedrin 63a): Treats swearing in idols’ names as acknowledgment of them.
- Rashi (Ex. 23:13): Forbids even dignifying mention of idols.
- Ramban: Extends prohibition to any legitimization through language.
- Midrash (Sifrei Devarim 61): A safeguard of purity in thought, word, and deed.
Contrast with Mitzvah 26 (Not to blaspheme):
- Mitzvah 26 forbids misuse of Hashem’s Name in curse.
- Mitzvah 46 forbids invoking idols’ names in oath.
- Together, Rambam (Yesodei HaTorah 6:1) says, they form two pillars of proper speech: honoring Hashem and rejecting idolatry.
Parallel to Mitzvah 209 (Not to swear falsely in Hashem’s Name):
- Both regulate sanctity of oaths.
- Ramban explains: swearing falsely dishonors Hashem, swearing by idols dishonors His sovereignty.
Contrast with Mitzvot 209–210 (Swearing Falsely / Taking Hashem’s Name in Vain):
- Mitzvah 46 forbids sanctifying falsehood by invoking idols, while 209–210 forbid desecrating Hashem’s Name through false or casual oaths.
- Together, they form a dual boundary: do not elevate what is false, and do not debase what is true.
- Rambam (Sefer HaMitzvot, Lo Ta’aseh 15, 62) distinguishes between misusing Hashem’s Name (a desecration of holiness) and invoking idols (a recognition of falsehood).
- Sefer HaChinuch (86, 435) notes the balance: speech must neither validate idolatry nor cheapen Hashem’s sanctity.
Commentaries
Applying this Mitzvah Today
Sanctifying Speech in a Pluralistic World
- Rambam (Hilchot Avodat Kochavim 5:10) rules that swearing by an idol constitutes giving it legitimacy. In today’s interfaith society, this mitzvah guides Jews to guard language — avoiding speech that elevates false gods, whether in oaths, pledges, or symbolic affirmations.
Contracts, Business, and Legal Settings
- Sefer HaChinuch (Mitzvah 86) explains that invoking idols in agreements is prohibited because it legitimizes them. Modern applications include ensuring that Jewish business contracts, court oaths, or affirmations never reference non-Jewish deities, maintaining integrity of Torah faith in legal and commercial life.
Digital and Cultural Influence
- In a world saturated with media, pop culture, and branding that often uses pagan names or mythological deities, this mitzvah reminds us not to attribute real power to such references. While casual mentions may not equal an oath, internalizing reverence for Hashem alone remains essential.
Interfaith Sensitivity Without Compromise
- Ramban (Ex. 23:13) notes that even casual reference to idols strengthens their presence. Today this applies to interfaith dialogue: Jews must show respect for others while carefully ensuring their own speech avoids reverence or ritual acknowledgment of foreign gods.
Guarding Covenant Identity
- Talmud (Sanhedrin 63b) teaches that even verbal recognition of an idol can desecrate Hashem’s Name. Applied today, the mitzvah calls for vigilance: whether signing forms, reciting pledges, or engaging in symbolic acts, a Jew must keep covenantal identity clear, sanctifying Hashem alone.
Notes on this Mitzvah's Fundamentals
Idolatry – עֲבוֹדָה זָרָה
- Rambam (Avodat Kochavim 5:10) writes that even a verbal act like swearing grants false legitimacy to idols. Talmud (Sanhedrin 63a) equates this with acknowledging them. Sefer HaChinuch stresses it distances Israel from any association with idolatry.
Speech – דָּבָר
- Sefer HaChinuch (86) explains that speech is sanctified by Torah and truth, and corrupting it with idol names pollutes its purpose. Rashi notes even casual mention is prohibited. Talmud emphasizes that sanctity of words is central to Torah life.
Faith – אֱמוּנָה
- Ramban teaches that invoking idols shows weakened faith in Hashem’s sovereignty. Midrash (Sifrei Devarim 61) says Israel must remove idolatry even from language. Rambam notes that pure emunah requires rejecting even verbal acknowledgment of false gods.
Reverence – יִרְאַת שָׁמַיִם
- Rambam stresses reverence for Heaven means guarding every word. Rashi explains that avoiding idols’ names reflects awe of Hashem’s uniqueness. Sefer HaChinuch describes this mitzvah as a fence that cultivates yirat Shamayim in daily speech.
Holiness – קְדֻשָּׁה
- Ramban links holiness to purity of tongue, forbidding any false deities from being dignified in word. Midrash teaches holiness means sanctifying even thought and speech. Sefer HaChinuch stresses holiness of language builds holiness of life.
Core Beliefs – יְסוֹדוֹת הָאֱמוּנָה
- Rambam (Sefer HaMitzvot, Negative Commandment 16) counts this prohibition as foundational: Torah defends ikarei emunah by outlawing verbal recognition of idols. Talmud (Sanhedrin 63a) confirms this protects faith from erosion.
Bein Adam L’Makom – בֵּין אָדָם לְמָקוֹם
- Rambam teaches this mitzvah is direct devotion to Hashem, rejecting any rival even in word. Rashi emphasizes that our covenant is expressed in how we speak of the Divine. Sefer HaChinuch explains: by removing idols from speech, we cleave entirely to Hashem.
