Numbers 32:32

28 So Moses gave orders about them to Eleazar the priest, to Joshua son of Nun, and to the family leaders of the tribes of Israel.

29 And Moses said to them, “If the Gadites and Reubenites cross the Jordan with you, with every man armed for battle before the LORD, and the land is subdued before you, then you are to give them the land of Gilead as a possession.

30 But if they do not arm themselves and go across with you, then they must accept their possession among you in the land of Canaan.”

31 The Gadites and Reubenites replied, “As the LORD has spoken to your servants, so we will do.

32 We will cross over into the land of Canaan armed before the LORD, that we may have our inheritance on this side of the Jordan.”

33 So Moses gave to the Gadites, to the Reubenites, and to the half-tribe of Manasseh son of Joseph the kingdom of Sihon king of the Amorites and the kingdom of Og king of Bashan—the land including its cities and the territory surrounding them.

34 And the Gadites built up Dibon, Ataroth, Aroer,

35 Atroth-shophan, Jazer, Jogbehah,

36 Beth-nimrah, and Beth-haran as fortified cities, and they built folds for their flocks.

Read all of Numbers 32