Reference for Bava Batra 268:4

אמר רב יוסף אמר רב יהודה אמר שמואל מפני מה אמרו זה בני נאמן הואיל ובעל שאמר גרשתי את אשתי נאמן

that he had a brother.<span class="x" onmousemove="('comment',' Our Mishnah teaches that, even in such a case, where owing to general belief the widow might be assumed to be subject to the laws of levirate marriage, the husband's statement that he has sons exempts her from the levirate marriage (V. infra). The second clause, according to which the statement, 'This is my brother' is not accepted, does not deal with the question of levirate, but with that of inheritance; v. Mishnah and notes a.l. ');">⁷</span> R. Joseph said in the name of Rab Judah in the name of Samuel: Why has it been stated [that if a person said], 'This is my son', he is believed?<span class="x" onmousemove="('comment',' And his widow is, accordingly, exempt from the Ievirate marriage. ');">⁸</span>

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