Related על ידים 4:4

A male Egyptian [convert] that marries a female Egyptian [convert], [or] a male Edomite [convert] that marries a female Edomite [convert]—the first and second generation is forbidden [from marrying into the congregation; see Devarim 23:9]; but the third is permitted. Said Rabbi Yehudah: Minyamin (sic! name in Ehrfurt manuscript) the Egyptian convert was havruta with one of the students of Rabbi Akiva. He said: "I am an Egyptian convert and I married an Egyptian convert. Behold I will go marry off my son to an Egyptian convert woman in order that my grandson should be fit to marry into the congregation, in order to fulfil what it says: "The third generation let them enter the congregation of God" (Devarim 23:9)." Rabbi Akiva said to him: "Minyamin you have erred in halakhah—Sanacherib, king of Assyria, came already and mixed up all of the nations; Ammonites and Moabites are not in their place, neither are Egyptians or Edomites in their place. Rather, a male Ammonite can marry a female Egyptian, a male Egyptian can marry a female Ammonite, and any one of these can marry anyone from any of the families of the earth, and any one of the families of the earth can marry any of these. It all depends on the child [whether he is able to marry into the community or not, since any of these people if they converted would be kosher Jews]."