'Possess Their Land' in the Bible

It is not for your righteousness or for the uprightness of your heart that you are going to possess their land, but because of the wickedness of these nations the Lord your God is driving them out before you, and to confirm the oath which the Lord swore to your fathers, to Abraham, Isaac, and Jacob.

Your wives, your children, and your cattle shall [be allowed to] stay in the land which Moses gave you on this [eastern] side of the Jordan, but you shall go across [the river] before your brothers (the other tribes) armed for battle, all your brave warriors, and you shall help them [conquer and take possession of their land],

The Lord your God will push them away from before you and drive them out of your sight and you will take possession of their land, just as the Lord your God promised you.