Numbers 32:28-30

Young's Literal Translation

²⁸ And Moses commandeth concerning them Eleazar the priest, and Joshua son of Nun, and the heads of the fathers of the tribes of the sons of Israel;

²⁹ and Moses saith unto them, `If the sons of Gad and the sons of Reuben pass over with you the Jordan, every one armed for battle, before Jehovah, and the land hath been subdued before you, then ye have given to them the land of Gilead for a possession;

³⁰ and if they do not pass over armed with you, then they have possessions in your midst in the land of Canaan.'