The same sacrifice which was offered for a sin-offering for the whole congregation, Le 4, because the Levites came in the stead of all the first-bern, which did in a manner represent the whole congregation.
Related Commentaries of Numbers 8:8
Numbers 8:8
8 Then let them take a young bullock with his meat offering, even fine flour mingled with oil, and another young bullock shalt thou take for a sin offering.