Numbers 6:11

Christian Standard Bible

The priest is to offer one as a sin offering and the other as a burnt offering  to make atonement on behalf of the Nazirite, since he incurred guilt because of the corpse. On that day he is to consecrate his head again.

Cross References

Leviticus 5:7

“But if he cannot afford an animal from the flock, then he may bring to the Lord two turtledoves or two young pigeons  as penalty for guilt for his sin #— #one as a sin offering and the other as a burnt offering.

Numbers 6:12

He is to rededicate his time of consecration to the Lord and to bring a year-old male lamb as a guilt offering.  But do not count the initial period of consecration because it became defiled.