Leviticus 1:14-16

14 ‘And if the ascending offering of his offering to יהוה is of birds, then he shall bring his offering of turtledoves or young pigeons.

15 ‘And the priest shall bring it to the slaughter-place, and shall wring off its head, and burn it on the slaughter-place, and its blood shall be drained out at the side of the slaughter-place.

16 ‘And he shall remove its crop with its feathers and throw it beside the slaughter-place on the east side, into the place for ashes.