Leviticus 3:5

‘Then the priest shall offer it up in smoke on the altar as food, an offering by fire to Yahweh.

‘And the fire on the altar shall be kept burning on it. It shall not go out, but the priest shall burn wood on it every morning; and he shall lay out the burnt offering on it and offer up in smoke the fat portions of the peace offerings on it.

Next he brought near the grain offering and filled his hand with some of it and offered it up in smoke on the altar, besides the burnt offering of the morning.

Then he slaughtered the ox and the ram, the sacrifice of peace offerings which was for the people; and Aaron’s sons handed the blood to him, and he splashed it around on the altar.

and for the sacrifice of peace offerings, two oxen, five rams, five male goats, five male lambs one year old. This was the offering of Gamaliel the son of Pedahzur.

“And you shall offer your burnt offerings, the flesh and the blood, on the altar of Yahweh your God; and the blood of your sacrifices shall be poured out on the altar of Yahweh your God, and you shall eat the flesh.

Also, before they offered up the fat in smoke, the priest’s young man would come and say to the man who was sacrificing, “Give the priest meat for roasting; he will not take boiled meat from you, only raw.”