Mishnah for Rosh Hashanah 3:6
דתנן שטרי חוב המוקדמין פסולין והמאוחרין כשרין
<big><b>GEMARA: </b></big>FOR KINGS. Why this law?<span class="x" onmousemove="('comment',' Why should we not be content to reckon the year of the king from the day on which he ascended the throne?');"><sup>14</sup></span> - R'Hisda said: For dealing with documents,<span class="x" onmousemove="('comment',' I.e., to enable us to determine which are antedated.');"><sup>15</sup></span>
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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