Reference for Bava Batra 252:1

מר סבר לא עשה כלום בפלגא ומר סבר בכולהו

[One] master<span class="x" onmousemove="('comment',' R. Papi. ');">¹</span> holds the opinion [that Raba's meaning was that the sale] of a part<span class="x" onmousemove="('comment',' Lit., 'half'. That part which belonged to his brother. The sale of his own share, however, is valid since, according to R. Papi. the firstborn comes into the possession of his own share even before the distribution had taken place. ');">²</span> [only of the estate was] invalid, and the [other] Master<span class="x" onmousemove="('comment',' R. Papa ');">³</span>

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