Reference for Yevamot 123:12

ואי איתמר בהא בהא קאמר ריש לקיש אבל בההיא אימא מודה ליה לר' יוחנן צריכא

follow their views.<span class="x" onmousemove="('comment',' Expressed elsewhere. ');">²⁹</span> For it was stated: If a man had children while he was an idolater and then he became a proselyte, he has, R. Johanan said, no firstborn in respect of inheritance,<span class="x" onmousemove="('comment',' The first son born after his conversion is not entitled to the double portion of the firstborn. ');">³⁰</span> since he already had<span class="x" onmousemove="('comment',' Before his conversion. ');">³¹</span>

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