Deuteronomy 3:18-22 - Instructions To The Transjordanian Tribes
18 And I shall command you in that time, saying, Jehovah your God gave to you this land to possess it; ye shall pass over armed before your brethren, the sons of Israel, all sons of strength. 19 Only your wives and your little ones and your cattle (I knew that much cattle to you) they shall dwell in your cities which I gave to you, 20 Till when Jehovah shall cause your brethren to rest as you, and they also shall possess the land which Jehovah, your God, gave to them on the other side of Jordan: and ye turned back each to his possession which I gave to you.
21 And I commanded Joshua in that time, saying, Thine eyes saw all that Jehovah, your God, did to these two kings: so will Jehovah do to all the kingdoms which ye pass through there. 22 Ye shall not be afraid of them, for Jehovah, your God, he shall fight for you.