Reference for Bava Metzia 53:21

אלא פרוטה שהוקרה איכא בינייהו מאן דאמר ומצאתה איכא ומאן דאמר אשר תאבד ליכא

Whence do we know that a lost article swept away by a river is permitted [to the finder]? From the verse, <i>'And so shalt thou do with all the lost things of thy brother which shall be lost to him and thou hast found it'</i>: [this implies.] that which is lost to him but is available<span class="x" onmousemove="('comment',' Lit., 'found.' ');">²¹</span>

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