Leviticus 9:1-5

Now it came about on the eighth day that Moses called Aaron and his sons and the elders of Israel;

and he said to Aaron, “Take for yourself a calf, a bull, as a sin offering and a ram as a burnt offering, both without defect, and offer them before the Lord.

Then you shall speak to the sons of Israel, saying, ‘Take a male goat as a sin offering, and a calf and a lamb, both one year old, without defect, as a burnt offering,

and an ox and a ram for peace offerings, to sacrifice before the Lord, and a grain offering mixed with oil; for today the Lord will appear to you.’ ”

So they took what Moses had commanded to the front of the tent of meeting, and the whole congregation came near and stood before the Lord.