EN ES
The Laws › Commandment #357
Commandment #357 · Negative · Inner Life · Camp Purity

Do Not Entertain Forbidden Thoughts

לֹא לְהַרְהֵר
Source: Deuteronomy 23:10  ·  Maimonides, Sefer HaMitzvot, Negative #606
כִּי יִהְיֶה בְךָ אִישׁ אֲשֶׁר לֹא יִהְיֶה טָהוֹר מִקְּרֵה לָיְלָה וְיָצָא אֶל מִחוּץ לַמַּחֲנֶה לֹא יָבֹא אֶל תּוֹךְ הַמַּחֲנֶה
“If there be among you any man, that is not clean by reason of uncleanness that chanceth him by night, then shall he go abroad out of the camp, he shall not come within the camp.”

The Camp That God Walks In

Deuteronomy 23:12–14: “Thou shalt have a place also without the camp, whither thou shalt go forth abroad... For the LORD thy God walketh in the midst of thy camp to deliver thee, and to give up thine enemies before thee; therefore shall thy camp be holy: that he see no unclean thing in thee, and turn away from thee.” The war camp is holy because God is present within it. The Torah does not merely prohibit physical filth in the camp — it requires that the camp be clean before divine scrutiny. What God sees is not limited to what human observers can detect.

Commandment #357 is derived from this context by a reasoning that runs inward: the physical camp must be clean (hence the laws about waste and bodily impurity in 23:10–14), and the source of the impurity that threatens the camp's holiness begins in the person's inner life. The nocturnal emission that creates impurity does not come from nowhere — it arises from the mind and heart's inner states. If the camp is to be holy before God, the people within it must govern their inner lives as well as their outward conduct.

Thought, Desire, and the Will

The inner-life commandments (#356–360) move progressively inward through the self: the eye (#356), the thought (#357), the hidden hatred in the heart (#358), the desire for revenge (#359), the harbored grudge (#360). Each successive commandment is less visible than the previous one. The eye's movement can sometimes be observed; the thought is entirely invisible; the hatred in the heart is hidden even from the person who is hated; revenge and grudge can be concealed indefinitely. The Torah's reach extends across all of these, claiming jurisdiction over the entire inner life of the covenant person.

Commandment #357's specific prohibition — on deliberately entertaining forbidden thoughts — addresses the threshold between the involuntary and the willed. The thought arrives (often involuntarily). The will then either engages with it and cultivates it, or dismisses it. The commandment does not hold the person responsible for the arrival; it holds them responsible for the engagement. This distinction is critical: a commandment that prohibited all forbidden thoughts regardless of will would be an impossible standard. The prohibition on “entertaining” — on keeping and cultivating — is achievable.

The Hidden Heart and Divine Awareness

Psalm 51:6–7 (in the Hebrew numbering, 51:8–9): “Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom. Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.” The psalm was written by David after his failure with Bathsheba — a failure that began with the eye (#356) and continued through desire, planning, and action. His acknowledgment: God desires truth “in the inward parts,” the hidden places that only God sees.

Commandment #357 is the commandment designed to govern those hidden parts — to extend the covenant's reach into the interior of the person where no human observer can follow. Jeremiah 17:10: “I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.” The Torah's legislation of the inner life is grounded in this claim: God searches the heart. The thought that is invisible to every other person is the object of divine scrutiny. Commandment #357 is Torah law applied to the domain that human courts can never reach but that God observes directly.

For reflection and group study
Commandment #357 is derived from camp purity laws, not from a direct prohibition on thought. What does it reveal about the Torah's method of legislation that a commandment governing the most private inner state is derived from a communal purity law about the war camp? What connects the holiness of a military encampment to the governance of individual thought?
The Torah acknowledges the involuntary (the nocturnal emission that is beyond the person's control) and creates a path back to purity through immersion and time. Commandment #357 governs the deliberate, not the involuntary. What does this distinction reveal about the Torah's understanding of moral responsibility? Where exactly is the line between what a person can be held accountable for in the inner life and what they cannot?

Read the source passage in the Torah reader.

Read in the Torah Reader — Deuteronomy 23:10