Leviticus 6:24-26

Then the LORD said to Moses, “Give Aaron and his sons the following instructions regarding the sin offering. The animal given as an offering for sin is a most holy offering, and it must be slaughtered in the LORD’s presence at the place where the burnt offerings are slaughtered. The priest who offers the sacrifice as a sin offering must eat his portion in a sacred place within the courtyard of the Tabernacle.