This promise is made upon condition of their performance of their duty, which they neglecting, they justly lose the benefit of it, as we see, Judges 2:1-3.
Related Commentaries of Deuteronomy 7:24
Deuteronomy 7:24
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.