Leviticus 9:4

Also a bullock and a ram. — The elders were thus to bring on behalf of the people, (1) a he-goat for a sin offering; (2) a yearling calf and a yearling sheep for a burnt offering; and (3) an ox and a ram for a peace offering.

A meat offering mingled with oil. — The oil was to be added, as, with the exception of the small portion offered to the Lord, the meat offering was the perquisite of the officiating priests who partook of it, together with their share of the victims, and the cakes had to be made palatable for the sacerdotal repast. (See Leviticus 2:1.)

For to-day the Lord will appear unto you. — That is, prepare and sanctify yourselves with these sacrifices, for the Lord is to manifest himself in an especial manner to signify his approval of the inauguration of Aaron and his family to the priesthood.