Numbers 5:6

5:6 “Tell the Israelites, ‘When a man or a woman commits any sin that people commit, thereby breaking faith with the Lord, and that person is found guilty,

Numbers 8:7

8:7 And do this to them to purify them: Sprinkle water of purification on them; then have them shave all their body and wash their clothes, and so purify themselves.

Numbers 8:12

8:12 When the Levites lay their hands on the heads of the bulls, offer the one for a purification offering and the other for a whole burnt offering to the Lord, to make atonement for the Levites.

Numbers 12:11

The Intercession of Moses

12:11 So Aaron said to Moses, “O my lord, please do not hold this sin against us, in which we have acted foolishly and have sinned!