Numbers 32:16-19

16Then the tribes of Gad and Reuben came up to Moses and said, “Allow us to build stone fences for our livestock and cities for our families here.

17Then we’ll be ready ⌞to march⌟ in battle formation  ahead of the other Israelites until we have brought them to their land. Meanwhile our families will live in walled cities, safe from the other people who live here.

18We will not return to our homes until every Israelite has received his own land.

19We won’t take possession of any land on the other side of the Jordan River, to the west and beyond. We already have our land here, east of the Jordan.”