On the subject of unclean things, uniformly through all the law, we may I think, without violence, consider the figure as referring to our nature, in an unrenewed state. Acts 10:14-15.
Related Commentaries of Leviticus 5:2
Leviticus 5:2-3
2 Or if a soul touch any unclean thing, whether it be a carcase of an unclean beast, or a carcase of unclean cattle, or the carcase of unclean creeping things, and if it be hidden from him; he also shall be unclean, and guilty.
3 Or if he touch the uncleanness of man, whatsoever uncleanness it be that a man shall be defiled withal, and it be hid from him; when he knoweth of it, then he shall be guilty.