Deuteronomy 7:23 KJV
But the Lord thy God shall deliver them unto thee, and shall destroy them with a mighty destruction, until they be destroyed.
Deuteronomy 7:23, King James Version
In context
22 And the Lord thy God will put out those nations before thee by little and little: thou mayest not consume them at once, lest the beasts of the field increase upon thee.
23 But the Lord thy God shall deliver them unto thee, and shall destroy them with a mighty destruction, until they be destroyed.
24 And he shall deliver their kings into thine hand, and thou shalt destroy their name from under heaven: there shall no man be able to stand before thee, until thou have destroyed them.