Numbers 32:17-32

17but we ourselves will be ready armed to go before the children of Israel, until we have brought them unto their place: and our little ones shall dwell in the fortified cities because of the inhabitants of the land. 18We will not return unto our houses, until the children of Israel have inherited every man his inheritance. 19For we will not inherit with them on the other side of the Jordan, and forward; because our inheritance is fallen to us on this side of the Jordan eastward.

20And Moses said unto them, If ye will do this thing, if ye will arm yourselves to go before Jehovah to the war, 21and every armed man of you will pass over the Jordan before Jehovah, until he hath driven out his enemies from before him, 22and the land is subdued before Jehovah; then afterward ye shall return, and be guiltless towards Jehovah, and towards Israel; and this land shall be unto you for a possession before Jehovah. 23But if ye will not do so, behold, ye have sinned against Jehovah; and be sure your sin will find you out. 24Build you cities for your little ones, and folds for your sheep; and do that which hath proceeded out of your mouth. 25And the children of Gad and the children of Reuben spake unto Moses, saying, Thy servants will do as my lord commandeth. 26Our little ones, our wives, our flocks, and all our cattle, shall be there in the cities of Gilead; 27but thy servants will pass over, every man that is armed for war, before Jehovah to battle, as my lord saith.

28So Moses gave charge concerning them to Eleazar the priest, and to Joshua the son of Nun, and to the heads of the fathers’housesof the tribes of the children of Israel. 29And Moses said unto them, If the children of Gad and the children of Reuben will pass with you over the Jordan, every man that is armed to battle, before Jehovah, and the land shall be subdued before you; then ye shall give them the land of Gilead for a possession: 30but if they will not pass over with you armed, they shall have possessions among you in the land of Canaan. 31And the children of Gad and the children of Reuben answered, saying, As Jehovah hath said unto thy servants, so will we do. 32We will pass over armed before Jehovah into the land of Canaan, and the possession of our inheritance shall remain with us beyond the Jordan.