Mischna zu Jeschijahu 10:78

On that day Judah, an Ammonite convert, came and stood before them in the house of study. He said to them: Do I have the right to enter into the assembly? Rabban Gamaliel said to him: you are forbidden. Rabbi Joshua said to him: you are permitted. Rabban Gamaliel said to him: the verse says, "An Ammonite or a Moabite shall not enter into the assembly of the Lord: even to the tenth generation" (Deuteronomy 23:4). R. Joshua said to him: But are the Ammonites and Moabites still in their own territory? Sanheriv, the king of Assyria, has long since come up and mingled all the nations, as it is said: "In that I have removed the bounds of the peoples, and have robbed their treasures, and have brought down as one mighty the inhabitants" (Isaiah 10:1. Rabban Gamaliel said to him: the verse says, "But afterward I will bring back the captivity of the children of Ammon," (Jeremiah 49:6) they have already returned. Rabbi Joshua said to him: [another] verse says, "I will return the captivity of my people Israel and Judah" (Jeremiah 30:3). Yet they have not yet returned. So they permitted him to enter the assembly.

On that day Judah, an Ammonite convert, came and stood before them in the house of study. He said to them: Do I have the right to enter into the assembly? Rabban Gamaliel said to him: you are forbidden. Rabbi Joshua said to him: you are permitted. Rabban Gamaliel said to him: the verse says, "An Ammonite or a Moabite shall not enter into the assembly of the Lord: even to the tenth generation" (Deuteronomy 23:4). R. Joshua said to him: But are the Ammonites and Moabites still in their own territory? Sanheriv, the king of Assyria, has long since come up and mingled all the nations, as it is said: "In that I have removed the bounds of the peoples, and have robbed their treasures, and have brought down as one mighty the inhabitants" (Isaiah 10:1. Rabban Gamaliel said to him: the verse says, "But afterward I will bring back the captivity of the children of Ammon," (Jeremiah 49:6) they have already returned. Rabbi Joshua said to him: [another] verse says, "I will return the captivity of my people Israel and Judah" (Jeremiah 30:3). Yet they have not yet returned. So they permitted him to enter the assembly.