Numbers 34:13-15

13Moses said to the Israelites, ‘That is the land for the Israelites to live in. You must use lots to give part of the land to each tribe. The Lord has told you to give it to the nine and a half tribes.

14That is because the tribes of Reuben and Gad, and half of Manasseh's tribe have their land already.

15Their land is on the east side of the Jordan River. It is on the other side of the river from Jericho city.’