Reference for Yevamot 156:8

והאנן תנן ממזרים ונתינין אסורין ואיסורן איסור עולם אחד זכרים ואחד נקבות לא קשיא הא כמאן דאמר דון מינה ומינה

— Rather, the reference is to an Ammonite<span class="x" onmousemove="('comment',' Who is ineligible for all time. (Ibid.). ');">¹⁹</span> who married an Egyptian wife.<span class="x" onmousemove="('comment',' Eligible only after three generations. ');">²⁰</span> If [the child of such a marriage] is a male, he is ascribed to the Ammonite;<span class="x" onmousemove="('comment',' His father, and is consequently forbidden for all time to enter the congregation. Had he been ascribed to his mother he would have been eligible after the third generation. ');">²¹</span>

Jastrow