Joshua 1:12-15

To the Reubenites and to the Gadites and to the half-tribe of Manasseh, Joshua said, “Remember the word which Moses the servant of the LORD commanded you, saying, ‘The LORD your God is giving you rest (peace) and will give you this land [east of the Jordan].’ Your wives, your children, and your cattle shall [be allowed to] stay in the land which Moses gave you on this [eastern] side of the Jordan, but you shall go across [the river] before your brothers (the other tribes) armed for battle, all your brave warriors, and you shall help them [conquer and take possession of their land], until the LORD gives your brothers rest, as He has given you, and they also take possession of the land which the LORD your God is giving them. Then you shall [be allowed to] return to your own land, and take possession of that which Moses the servant of the LORD gave you beyond the Jordan toward the sunrise.”