Mishneh Torah, Marriage 5

Hook

Why does the sanctity of a marriage bond depend on the market value of a piece of bread? In the eyes of the law, kiddushin (betrothal) is a transaction—and if you try to pay with something that is legally "void," the transaction never happens.

Context

Rambam (Maimonides) codifies these rules in Hilchot Ishut (Marriage), drawing heavily from the Talmudic discussion in Kiddushin 55b. The core principle here is that for kiddushin to be valid, the groom must give something of tangible value (p'rutah). If the object is forbidden for any benefit, it is treated as legally non-existent.

Text Snapshot

"When a man consecrates a woman with an object from which it is forbidden to derive benefit... she is not consecrated. [This ruling applies] even if the prohibition against deriving benefit from the object is merely Rabbinic in origin—e.g., chametz during the sixth hour on the fourteenth of Nisan." Mishneh Torah, Marriage 5:1

Close Reading

1. Structure: Rambam establishes a binary: either the object has intrinsic value, or it is a hefker (ownerless) void. He categorizes prohibitions by their source (Torah vs. Rabbinic) to test the outer limits of this "value."
2. Key Term: Assur B'hana'ah (Forbidden for benefit). This is the "legal black hole" of Jewish law—items like chametz on Passover or items used for idol worship. Because you cannot legally derive a cent of utility from them, they cannot serve as currency.
3. Tension: The tension lies in the Maggid Mishneh's debate: Does the prohibition make the object inherently worthless, or is it just a personal restriction on the woman? Rambam insists that if the object is "forbidden," it lacks the "money-status" required to initiate a sacred bond.

Two Angles

• Rambam’s Formalism: He treats the object as a cheftza (an entity). If the law strips the object of its benefit, it loses the status of "money," and the betrothal is null.
• Rabbenu Asher’s (Rosh) Nuance: He argues that if the prohibition is only Rabbinic and not Scriptural, the object might still retain enough "value" in a broader sense to create a bond, shifting the focus from the object’s legal status to the act of transfer.

Practice Implication

This halakha teaches us that "value" isn't just a subjective feeling—it is defined by what is permitted to us. In decision-making, we must ask: Are we building our commitments on things that are "forbidden" or "void" in our own framework? A foundation built on something you cannot legally "use" or "benefit from" cannot support a lasting structure.

Chevruta Mini

1. If you were to give an object that is forbidden to you, but permitted to someone else, does it have "value"?
2. Why is the act of kiddushin so rigid about "money," even though it is meant to be a spiritual act?

Takeaway

A valid commitment requires an asset that is legally and morally "real" to both parties; if the currency is forbidden, the contract is void.