Numbers 33:55 But if you do not drive out the inhabitants of the land, those you allow to remain will become barbs in your eyes and thorns in your side. They will give you trouble in the land where you will live."
Deuteronomy 1:7 Break camp and advance into the hill country of the Amorites; gotoall the neighboring peoples in the Arabah, in the mountains, in the western foothills, in the Negev and along the seacoast to the land of the Canaanites and to Lebanon, as far as the great river, the Euphrates. See, I have given you this land. Go in and take possession of the land that the Lord swore he would give to your fathers"
deuteronomy 6:10 ..to give you a land with large, flourishing cities you did not build, houses filled with all kinds of hings you did not provide, wells you did not dig, and vineyards and olive groves you did not plant"
Deuteronomy 7 When the Lord your G-d brings you into the land you are entering to possess and drives out before you many nations - the Hittites, Girgashites, Amorites, Canaanites, Perizzites, Hivites and Jebusites, seven nations larger and stronger than you - and when the Lord your G-d has delivered them over to you and you have defeated them, then you must destroy them totally. Make no treaty with them, and show them no mercy.