daf bit: Shabbat 78
Our rabbis taught: if one carries out a tax-collector's receipt before having shown it to the collector he is liable, but if after, he is not. But R. Yehudah says he is liable even after because he still needs the document (as proof that he does not owe). Similarly for a note of debt, the rabbis say he is liable before settlement but not after, and R. Yehudah says even after. R. Yosef raises the question of whether it is permitted to keep a note of debt after it is settled, and Abaye says all agree that a note of debt cannot be kept. So the disagreement here is about the case of waiting for confirmation; a debt might be settled but be waiting for confirmation. (78b)
I seem to recall learning, I think in Bava Metzia, that when a debt is settled the note is destroyed. Here, peaking ahead to the next page, I see a reference to writing a quittance. I don't know if that means we do both, if a quittance doesn't end up being normative, or if my memory is just plain faulty. (My, err, money is on the last.) Also, I'm unclear on a system where payment and settlement (quittance or destroying the note) aren't simultaneous.

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My weekly talmud group just finished studying this sugya, so it's sort of handy in my brain.