Deuteronomy 3:21
And I commanded Joshua at that time, saying, Thine eyes have seen all that the Lord your God hath done unto these two kings: so shall the Lord do unto all the kingdoms whither thou passest.
Cross-references
Deuteronomy 31:4 explicitly recalls the defeat of Sihon and Og as a pattern for future conquests.
Numbers 27:18-23 describes the actual commissioning of Joshua that Moses recalls in Deuteronomy 3:21.
In Joshua 10:25, Joshua echoes Moses' promise — the same 'thus the LORD will do to all your enemies' — applying it to his commanders.
In 1 Samuel 17:36, David uses past victories over lion and bear to guarantee victory over Goliath — same logic as past defeats of kings securing future conquest.
In 1 Samuel 17:37, David explicitly trusts God's past deliverance for future deliverance, mirroring the exact logic of Deuteronomy 3:21.
In 2 Corinthians 1:10, Paul states God delivered and will deliver again — the precise pattern of past deliverance guaranteeing future hope.