Numbers 32:26-29

26Our children and wives, our flocks and herds will remain here in the cities of Gilead.

27But your servants, every man who is armed for battle, will cross over to fight before the Lord, just as our lord says.”

28Then Moses gave orders about them to Eleazar the priest and Joshua son of Nun and to the family heads of the Israelite tribes.

29He said to them, “If the Gadites and Reubenites, every man armed for battle, cross over the Jordan with you before the Lord, then when the land is subdued before you, you must give them the land of Gilead as their possession.