Numbers 6:11

New Century Version

The priest will offer one as a sin offering and the other as a burnt offering. This removes sin so they will belong to the Lord. (They had sinned because they were near a dead body.) That same day they will again promise to let their hair grow

Cross References

Leviticus 5:7

“ ‘But if the person cannot afford a lamb, he must bring two doves or two young pigeons to the Lord as the penalty for his sin. One bird must be for a sin offering, and the other must be for a whole burnt offering.

Numbers 6:12

and give themselves to the Lord for another special time. They must bring a male lamb a year old as a penalty offering. The days of the special time before don’t count, because they became unclean during their first special time.