Psalm 119:119 (a) This shows the worthless character of the ungodly.
Proverbs 26:23 (b) The expression here typifies hypocrisy - a beautiful silver covering on a worthless bit of broken pot has no value.
Isaiah 1:25 (b) The word here describes those unhappy and deceitful things in the life of Israel which GOD would take away by His various cleaning processes. (See also Ezekiel 22:18).