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 17:5

17:5 And the staff of the man whom I choose will blossom; so I will rid myself of the complaints of the Israelites, which they murmur against you.”