Deuteronomy 3:18-22 - Instructions To The Transjordanian Tribes
18 And I commanded you at that time, saying, LORD your God has given you this land to possess it. Ye shall pass over armed before your brothers the sons of Israel, all the men of valor. 19 But your wives, and your little ones, and your cattle, (I know that ye have much cattle,) shall abide in your cities which I have given you 20 until LORD gives rest to your brothers, as to you, and they also possess the land which LORD your God gives them beyond the Jordan, then ye shall return every man to his possession, which I have given you.
21 And I commanded Joshua at that time, saying, Thine eyes have seen all that LORD your God has done to these two kings. So shall LORD do to all the kingdoms where thou go over. 22 Ye shall not fear them, for LORD your God, he it is who fights for you.