Numbers 6:11-12

11and the priest shall offer one for a sin offering and the other for a burnt offering, and make atonement for him, because he sinned by reason of the dead body. And he shall consecrate his head that same day 12and separate himself to the Lord for the days of his separation and bring a male lamb a year old afor a guilt offering. But the previous period shall be void, because his separation was defiled.

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