Reference for Yevamot 155:7

ואיצטריך למיכתב להם ואיצטריך למיכתב אשר יולדו דאי כתב רחמנא אשר יולדו ה"א מבניהם מנה כתב רחמנא להם ואי כתב רחמנא להם ה"א מצרית מעוברת שנתגיירה היא ובנה חד כתב רחמנא אשר יולדו

Be guided by the status of the ineligible among them.<span class="x" onmousemove="('comment',' Whether the father is an Egyptian proselyte and the mother is of Israel, or whether the mother is an Egyptian and the father is an Israelite. the children are in either case ineligible until the third generation. ');">²⁴</span> It was necessary [for Scripture] to write <i>Unto them</i>,<span class="x" onmousemove="('comment',' Deut. XXIII. 9. ');">²⁵</span> and it was also necessary for it to write, That are born.<span class="x" onmousemove="('comment',' Deut. XXIII. 9. ');">²⁵</span> For had the All Merciful written only. 'That are born', it might have been presumed that the counting must begin from their children,<span class="x" onmousemove="('comment',' The proselytes themselves not being counted at all in the generations. ');">²⁶</span>

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