Joshua 1:12-15

Then Joshua said to the people of Reuben, Gad, and East Manasseh, “Remember what Moses, the servant of the LORD, told you. He said the LORD your God would give you rest and would give you this land. Now the LORD has given you this land east of the Jordan River. Your wives, children, and animals may stay here, but your fighting men must dress for war and cross the Jordan River ahead of your brothers to help them. The LORD has given you a place to rest and will do the same for your brothers. But you must help them until they take the land the LORD their God is giving them. Then you may return to your own land east of the Jordan River, the land that Moses, the servant of the LORD, gave you.”