Reference for Bekhorot 97:34

כי פליגי לאחר שלשים יום ונתעכלו המעות

BUT R'JUDAH SAYS: HIS SON COMES FIRST FOR THE COMMAND TO REDEEM HIM WAS UPON HIS FATHER,<span class="x" onmousemove="('comment',' The duty of redeeming this father was on his father who died, and the duty of his son is upon him.');">²⁹</span>

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