As soon as he knoweth it, he must not delay to make his peace with God. And though it was sin before, though not known, yet the knowledge of it made it worse, and therefore required the more speedy repentance. He shall be guilty, not only ceremonially by that touch, but morally for his violation and contempt of God's authority and command.
Related Commentaries of Leviticus 5:3
Leviticus 5:3
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.