Reference for Yevamot 43:12

<big><strong>גמ׳</strong></big> מכל מקום לאתויי מאי אמר רב יהודה לאתויי ממזר פשיטא אחיו הוא מהו דתימא לילף אחוה אחוה מבני יעקב מה להלן כשרין ולא פסולין אף כאן כשרין ולא פסולין קמ"ל

<b><i>MISHNAH</i></b>. IF ONE HAS ANY KIND OF BROTHER,<span class="x" onmousemove="('comment',' This is explained in the Gemara. Lit., 'from any place'. ');">²⁹</span> [THAT BROTHER] IMPOSES UPON HIS BROTHER'S WIFE THE OBLIGATION OF THE LEVIRATE MARRIAGE AND IS DEEMED TO BE HIS BROTHER IN EVERY RESPECT. FROM THIS IS EXCLUDED A BROTHER BORN FROM A SLAVE OR A HEATHEN.<span class="x" onmousemove="('comment',' Such children assume their mother's status of inferiority, and are not regarded as one's paternal brothers. ');">³⁰</span> IF ONE HAS ANY KIND OF SON, [THAT SON] EXEMPTS HIS FATHER'S WIFE FROM THE LEVIRATE MARRIAGE, IS LIABLE TO PUNISHMENT FOR STRIKING OR CURSING [HIS FATHER]. AND IS DEEMED TO BE HIS SON IN EVERY RESPECT. FROM THIS IS EXCLUDED THE SON OF A SLAVE OR A HEATHEN.<span class="x" onmousemove="('comment',' Cf. n. 9. ');">³¹</span>

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