Deuteronomy 2:21

2:21 They are a people as powerful, numerous, and tall as the Anakites. But the Lord destroyed the Rephaites in advance of the Ammonites, so they dispossessed them and settled down in their place.

Deuteronomy 7:1

The Dispossession of Nonvassals

7:1 When the Lord your God brings you to the land that you are going to occupy and forces out many nations before you – Hittites, Girgashites, Amorites, Canaanites, Perizzites, Hivites, and Jebusites, seven nations more numerous and powerful than you –

Deuteronomy 28:62-63

28:62 There will be very few of you left, though at one time you were as numerous as the stars in the sky, because you will have disobeyed the Lord your God. 28:63 This is what will happen: Just as the Lord delighted to do good for you and make you numerous, he will take delight in destroying and decimating you. You will be uprooted from the land you are about to possess.