Leviticus 1:16-18

16 Soothly he shall cast forth the little bladder of the throat, or the crop, and the feathers beside the altar, at the east coast, in the place in the which the ashes be wont to be cast out;

17 and the priest shall break the wings thereof, and he shall not carve it, neither part it with iron; and he shall burn it on the altar, when fire is put under the wood; it is a burnt sacrifice, and an offering of sweetest odour to the Lord.