Numbers 8:20

8:20 So Moses and Aaron and the entire community of the Israelites did this with the Levites. According to all that the Lord commanded Moses concerning the Levites, this is what the Israelites did with them.

Numbers 11:11-12

11:11 And Moses said to the Lord, “Why have you afflicted your servant? Why have I not found favor in your sight, that you lay the burden of this entire people on me? 11:12 Did I conceive this entire people? Did I give birth to them, that you should say to me, ‘Carry them in your arms, as a foster father bears a nursing child,’ to the land which you swore to their fathers?

Numbers 18:3

18:3 They must be responsible to care for you and to care for the entire tabernacle. However, they must not come near the furnishings of the sanctuary and the altar, or both they and you will die.