Leviticus 1:16

With his feathers, or, with its dung or filth, to wit, contained in the crop, and in the guts. On the east part, to wit, of the tabernacle. Here the filth was cast, because this was the remotest place from the holy of holies, which was in the west end; to teach us, that impure things and persons should not presume to approach to God, and that they should be banished from his presence. By the place of the ashes; the place where the ashes fell down and lay, whence they were afterwards removed without the camp. See Leviticus 4:12, Leviticus 6:10,11 8:17.