Leviticus 1:16-17

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.

17He will hold the parts that the bird uses to fly. And then he will tear open the body. But he must not tear it completely. He will burn all of it on the fire that is on the altar. The smell of it while it is burning will give the Lord pleasure.