Numbers 6:10-11

10On day 8, he must bring two doves or two young pigeons to the door of the Tent of Meeting. He must give them to the priest.

11The priest must sacrifice one bird as a sin offering and the other bird as a burnt offering. The priest must do that because the Nazirite sinned. He went too near to a dead body. That will make the Nazirite's head clean again on that same day.