Leviticus 7:36-38

New Century Version

³⁶ On the day the Lord appointed the priests, he commanded Israel to give this share to them, and it is to be given to the priests as their share from now on.

³⁷ These are the teachings about the whole burnt offering, the grain offering, the sin offering, the penalty offering, the offering for the appointment of priests, and the fellowship offering. ³⁸ The Lord gave these teachings to Moses on Mount Sinai on the day he commanded the Israelites to bring their offerings to the Lord in the Sinai Desert.