Albert Barnes Commentary Leviticus 1:16

"and he shall take away its crop with the filth thereof, and cast it beside the altar on the east part, in the place of the ashes:" — Leviticus 1:16 (ASV)

His crop with his feathers - The weight of authority is in favor of the marginal rendering. It is most probable that the feathers were burned with the body, and that the wings, mentioned in (Leviticus 1:17), were not mutilated.

The place of the ashes - The ashes were daily removed from the altar (except on certain holy days) and thrown into a heap on its eastern side. When the heap became inconveniently large, it was removed in vessels appropriated to the purpose to a spot without the camp (Leviticus 4:12; Leviticus 6:11).