Numbers 2:34

2:34 So the Israelites did according to all that the Lord commanded Moses; that is the way they camped under their standards, and that is the way they traveled, each with his clan and family.

Numbers 13:2

13:2 “Send out men to investigate the land of Canaan, which I am giving to the Israelites. You are to send one man from each ancestral tribe, each one a leader among them.”

Numbers 36:8

36:8 And every daughter who possesses an inheritance from any of the tribes of the Israelites must become the wife of a man from any family in her father’s tribe, so that every Israelite may retain the inheritance of his fathers.