Deuteronomy 3:16-20

16But to the Reubenites and the Gadites I gave the territory extending from Gilead down to the Arnon Gorge (the middle of the gorge being the border) and out to the Jabbok River, which is the border of the Ammonites.

17Its western border was the Jordan in the Arabah, from Kinnereth to the Sea of the Arabah (that is, the Dead Sea), below the slopes of Pisgah. 18I commanded you at that time: “The LORD your God has given you this land to take possession of it. But all your able-bodied men, armed for battle, must cross over ahead of the other Israelites. 19However, your wives, your children and your livestock (I know you have much livestock) may stay in the towns I have given you,

20until the LORD gives rest to your fellow Israelites as he has to you, and they too have taken over the land that the LORD your God is giving them across the Jordan. After that, each of you may go back to the possession I have given you.”