Reference for Bava Batra 255:6

מר בר רב אשי אכשר באבא דאבא ולית הלכתא כמר בר רב אשי

and the Sages say he may not!<span class="x" onmousemove="('comment',' Which shows, like the message of R. Abba, that once a man has renounced his legal rights, he cannot retract. Why, then, the need for R. Abba's statement, seeing that the underlying principle has already been enunciated in a Mishnah? ');">¹¹</span> He<span class="x" onmousemove="('comment',' R. Abba. ');">¹²</span>

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