Reference for Bava Metzia 60:20

תניא נמי הכי מצא טלית וקרדום

— Said Rab Judah in Rab's name: Up to three days.<span class="x" onmousemove="('comment',' But if there longer, it must be assumed lost. ');">²⁴</span> How so? If [he sees it] at night, even a single hour [shews that it is lost]; if by day, even if it is there longer, it is still [not proof it is lost]! — This arises only if it was seen either before daybreak or at twilight; now, for three days we assume that it is mere chance that it went forth [at these unusual hours]; but if more, it is certainly lost. It has been taught likewise: If one finds a garment or a spade

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