Mishnah for Rosh Hashanah 3:8
אמר מר מלך שעמד בעשרים ותשעה באדר כיון שהגיע אחד בניסן עלתה לו שנה הא
he is reckoned to have reigned a year. If on the other hand he ascended the throne on the first of Nisan, he is not reckoned to have reigned a year till the next first of Nisan comes round. The Master has said, 'If a king ascends the throne on the twenty-ninth of Adar, as soon as the first of Nisa arrives he is reckoned to have reigned a year.'
Mishnah Sheviit
A pre-dated prozbul is valid, but a post-dated one, is invalid. Pre-dated loan documents [of loans] are invalid, but post-dated one valid. If one borrows from five persons, then he writes a separate prozbul for each [creditor]. But if five borrow from the same person, then he writes only one prozbul for them all.
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