Leviticus 3:1, 16-17

“If you present an animal from the herd as a peace offering to the LORD, it may be a male or a female, but it must have no defects.

and the priest will burn them on the altar. It is a special gift of food, a pleasing aroma to the LORD. All the fat belongs to the LORD. “You must never eat any fat or blood. This is a permanent law for you, and it must be observed from generation to generation, wherever you live.”