'Consecrate' in the Bible

“Speak to the Israelites and tell them: When a man or woman makes a special vow, a Nazirite vow, to consecrate himself to the Lord,

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 sinned because of the corpse. On that day he must consecrate his head again.