Deuteronomy 3:18-22 - Instructions To The Transjordanian Tribes
18 And I commanded you at that time, saying, Jehovah your God hath given you this land to take possession of it: ye shall pass over armed before your brethren the children of Israel, all who are combatants. 19 Only 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 Jehovah give rest to your brethren, as well as to you, and they also take possession of the land that Jehovah your God giveth them beyond the Jordan; then shall ye return, each man to his possession, which I have given you.
21 And I commanded Joshua at that time, saying, Thine eyes have seen all that Jehovah your God hath done to these two kings: so will Jehovah do to all the kingdoms to which thou shalt go. 22 Ye shall not fear them; for Jehovah your God, he will fight for you.