Numbers 32:16-19

16Then they came up to him and said, “We will build sheepfolds for our livestock and cities for our children.

17But we are prepared to arm ourselves and go ahead of Bnei-Yisrael until we have brought them to their place. Our children will live in the cities fortified against the inhabitants of the land.

18We will not return to our homes until each one of Bnei-Yisrael has received his inheritance.

19Yet we will not inherit with them on the side beyond the Jordan, since our inheritance has come on the east side of the Jordan.”