Lev 5, 6

v17 Now if a person sins and does any of the things which the Lord has commanded not to be done, though he was unaware, still he is guilty and shall bear his punishment.

KEYPOINTS:
SIN IS SIN whether we know of it or not. When I am in a new country and walk across the road and the police fine me, I have no choice in the matter. I cannot plead ignorance because I am guilty of breaking the law of the land. In the same way justice must be served by a just God. All things come back to 'His Name's Sake'.