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.