Leviticus 5
2 Ref Or if a soul touch any unclean thing, whether it be a carcass of an unclean beast, or a carcass of unclean cattle, or the carcass of unclean creeping things, and if it be hidden from him; he also shall be unclean, and guilty.
3 Ref 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.