Exodus 23
30 By little and little I will drive them out from before thee, until thou be increased, and inherit the land.

Judges 11
21 And the LORD God of Israel delivered Sihon and all his people into the hand of Israel, and they smote them: so Israel possessed all the land of the Amorites, the inhabitants of that country.
22 And they possessed all the coasts of the Amorites, from Arnon even unto Jabbok, and from the wilderness even unto Jordan.
23 So now the LORD God of Israel hath dispossessed the Amorites from before his people Israel, and shouldest thou possess it?
24 Wilt not thou possess that which Chemosh thy god giveth thee to possess? So whomsoever the LORD our God shall drive out from before us, them will we possess.

Numbers 33
55 But if ye will not drive out the inhabitants of the land from before you; then it shall come to pass, that those which ye let remain of them shall be pricks in your eyes, and thorns in your sides, and shall vex you in the land wherein ye dwell.
56 Moreover it shall come to pass, that I shall do unto you, as I thought to do unto them.