Sacrifices were offered for the Whole Nation

Aaron shall then slaughter the goat for the sin offering for the people and bring its blood behind the veil, and with its blood he must do as he did with the bull’s blood: He is to sprinkle it against the mercy seat and in front of it. …

The next day they offered sacrifices and presented burnt offerings to the LORD: a thousand bulls, a thousand rams, and a thousand lambs, along with their drink offerings, and other sacrifices in abundance for all Israel.