Children born to them in the third generation may enter the assembly of the LORD.
Interpreters are not agreed what is here meant by entering into the congregation of the Lord, which is here forbidden to eunuchs and to bastards, Ammonites and Moabites, for ever, but to Edomites and Egyptians only till the third generation. 1. Some think they are hereby excluded from communicating with the people of God in their religious services.
Commenting on Deuteronomy 23:1-8
The children that are begotten of them, Of such as became proselytes: shall enter into the congregation of the Lord in their third generation; not in the third generation from the time that this law was made, but from the time that any of them should embrace the true religion; their sons were the second generation, and their grandchildren the third; and such might be...
The children that are begotten of them shall enter into the congregation of the LORD in their third generation. (e) If the fathers have renounced their idolatry, and received circumcision.