Reference for Bava Kamma 208:5

נתן לו את הקרן וכו': אלמא חומש ממונא הוא ואם מיית משלמי ליה יורשין

it would be of no avail, for before you come back R. Abba might perhaps [in the meantime] have died,<span class="x" onmousemove="('comment',' On account of old age. ');">⁷</span> and as the money would then already have been transferred to the heirs the receipt executed by R. Abba would be of no avail.'<span class="x" onmousemove="('comment',' For the contract of agency as any other executory contract would by the death of the principal become null and void, just as he then instantly becomes deprived of the ownership of all his possessions. ');">⁸</span>

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