Chullin 94

Sugya Map: The Ethics of Gneivat Da’at (Deception)

• Core Issue: Does the prohibition of Gneivat Da’at (deception) apply to non-Jews? And does it extend to situations where the other party "misleads themselves"?
• Nafka Mina: Can a merchant use ambiguous language to sell meat? Can one offer hospitality one knows will be refused?
• Primary Sources: Chullin 94a, Shulchan Aruch, Choshen Mishpat 228:6.

Text Snapshot

Chullin 94a: "Shmuel said: It is prohibited to deceive people, and even a gentile." The Gemara reconciles this with the story of Mar Zutra, concluding: "Mar Zutra misled himself." The nuance lies in the distinction between active deception (yesarhev—importuning) and passive non-correction of another’s false assumption.

Readings

• Rashi (94a, s.v. lo yesarhev): Defines the prohibition as "stealing the mind" (gonev da’ato)—creating a false sense of obligation or gratitude where none exists. The chiddush: The prohibition is not just about the victim's loss, but the perpetrator’s performative dishonesty.
• Rabbeinu Gershom (94a, s.v. lo yarbeh): Emphasizes that "multiplying gifts" when one knows they will be refused is a breach of social trust. The chiddush: Social etiquette is governed by the same stricture as ritual law.

Friction

Kushya: If Shmuel forbids deceiving a gentile, how can a butcher announce "meat for the soldiers" to hide that it is tereifa (non-kosher)? Terutz: The Gemara distinguishes between active falsehood and omission. The butcher does not say "it is kosher"; he says "meat for soldiers." If the buyer assumes it is top-tier meat, that is the buyer "misleading themselves." Deception requires an active, misleading input; silence in the face of another's faulty inference is generally not Gneivat Da’at.

Intertext

• Choshen Mishpat 228:6: The Rema codifies that Gneivat Da’at applies equally to gentiles.
• Tanya, Ch. 29: Explains that the "mind" (da'at) is the vessel of the soul; deceiving another is a form of spiritual theft that disrupts the connection between souls.

Psak/Practice

The heuristic is clear: Active misrepresentation is strictly forbidden. However, if a counterparty makes an assumption based on their own observation or environment, and you have not explicitly affirmed their error, you are not a ganav da’at. The line is drawn at active solicitation of a false impression.

Takeaway

Integrity is not just about truth-telling; it is about refusing to let others build their reality on a lie you have manufactured. If you aren't the source of the error, you aren't the thief.