Numbers 32:33

30 but if they will not pass over with you armed, they shall have possessions among you in the land of Canaan.

31 The children of Gad and the children of Reuben answered, saying, As Yahweh has said to your servants, so will we do.

32 We will pass over armed before Yahweh into the land of Canaan, and the possession of our inheritance [shall remain] with us beyond the Jordan.

33 Moses gave to them, even to the children of Gad, and to the children of Reuben, and to the half-tribe of Manasseh the son of Joseph, the kingdom of Sihon king of the Amorites, and the kingdom of Og king of Bashan, the land, according to the cities of it with [their] borders, even the cities of the land round about.

34 The children of Gad built Dibon, and Ataroth, and Aroer,

35 and Atrothshophan, and Jazer, and Jogbehah,

36 and Beth-nimrah, and Beth-haran: fortified cities, and folds for sheep.