Leviticus 1:14-16

14If a person wants to give a bird to the Lord, it must be a dove or a pigeon.

15The priest will bring the bird to the altar. He will tear off the head and he will burn it on the altar. The priest will pour the blood onto the side of the altar.

16Then the priest will remove the part of the bird where the food is stored. He will throw it on the east side of the altar, with the ashes.