Reference for Bava Batra 217:1

דהכא תרתי והכא חדא

[from the fact] that in one case<span class="x" onmousemove="('comment',' Lit., 'here', i.e., the case of a son. ');">¹</span> [there are] two [advantages]<span class="x" onmousemove="('comment',' The designation of a handmaid, and the redemption of a field of his (father's) possession. ');">²</span>

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