and the priest shall offer one as a sin offering and the other as a burnt offering, and make atonement for him, because he sinned in regard to the corpse; and he shall sanctify his head that same day.
Numbers 6:11
Surrounding context
6:10 Then on the eighth day he shall bring two turtledoves or two young pigeons to the priest, to the door of the tabernacle of meeting;
6:11 and the priest shall offer one as a sin offering and the other as a burnt offering, and make atonement for him, because he sinned in regard to the corpse; and he shall sanctify his head that same day.
6:12 He shall consecrate to the LORD the days of his separation, and bring a male lamb in its first year as a trespass offering; but the former days shall be lost, because his separation was defiled.