Leviticus 1:14-16

14‘But if his offering to the Lord is a burnt offering of birds, then he shall bring his offering from the 1turtledoves or from young pigeons.

15The priest shall bring it to the altar, and wring off its head and offer it up in smoke on the altar; and its blood is to be drained out 2on the side of the altar.

16He shall also take away its crop with its feathers and cast it beside the altar eastward, to the place of the 34ashes.