Numbers 3:12

3:12 “Look, I myself have taken the Levites from among the Israelites instead of every firstborn who opens the womb among the Israelites. So the Levites belong to me,

Numbers 5:4

5:4 So the Israelites did so, and expelled them outside the camp. As the Lord had spoken to Moses, so the Israelites did.

Numbers 36:7

36:7 In this way the inheritance of the Israelites will not be transferred from tribe to tribe. But every one of the Israelites must retain the ancestral heritage.