Matthew Henry Commentary Leviticus 7:35-38

"This is the anointing-portion of Aaron, and the anointing-portion of his sons, out of the offerings of Jehovah made by fire, in the day when he presented them to minister unto Jehovah in the priest`s office; which Jehovah commanded to be given them of the children of Israel, in the day that he anointed them. It is [their] portion for ever throughout their generations. This is the law of the burnt-offering, of the meal-offering, and of the sin-offering, and of the trespass-offering, and of the consecration, and of the sacrifice of peace-offerings; which Jehovah commanded Moses in mount Sinai, in the day that he commanded the children of Israel to offer their oblations unto Jehovah, in the wilderness of Sinai." — Leviticus 7:35-38 (ASV)

Solemn acts of religious worship are not things that we may do or not do as we please; we omit them at our peril. Observing the laws of Christ cannot be less necessary than observing the laws of Moses.