Jeremiah 2:22 (b) By this we understand the human schemes, efforts and plans that men use to get rid of their sins. Soap is a human invention for cleansing purposes. So various religious groups have ways and means which they offer to the public as remedies for the sins of men. These are compared to soap.
Malachi 3:2 (b) This emblem represents the thoroughness and effectiveness of the judgments of GOD.