Leviticus 9:3, 15

And unto the children of Israel thou shalt speak, saying, Take ye a kid of the goats for a sin offering; and a calf and a lamb, both of the first year, without blemish, for a burnt offering

And he brought the people's offering, and took the goat, which was the sin offering for the people, and slew it, and offered it for sin, as the first.