'Possess Their Land' in the Bible

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.