Leviticus 5:3

Or if he touch the uncleanness of man ,.... The dead body of a man, or the bone of a dead body, or a grave, or any profluvious or menstruous person:

whatsoever uncleanness it be that a man shall be defiled withal : not morally, but ceremonially:

and it be hid from him ; he is not sensible that he has touched any thing ceremonially unclean:

when he knoweth of it , then he shall be guilty : acknowledge his guilt, and offer a sacrifice for it, as after directed.