Deuteronomy 23:8
The children that are begotten of them shall enter into the congregation of the Lord in their third generation.
Cross-reference
Deuteronomy 23:3 permanently excludes Ammonites and Moabites, while Edomites and Egyptians are admitted in the third generation — a clear contrast.
Romans 3:29 argues God is God of Gentiles too — foreshadowed by this law allowing foreigners into the assembly after three generations.
Ephesians 2:13 says those far off are brought near by Christ — a fuller inclusion than the third-generation rule for Edomites and Egyptians here.
Romans 3:30 declares God justifies both Jews and Gentiles by faith — a broader inclusion than the limited third-generation admission for Edomites and Egyptians here.
Ephesians 2:12 describes Gentiles as formerly excluded from Israel's commonwealth — contrasting with the limited inclusion granted to Edomites and Egyptians here.