Psalms 55:21 The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords. (KJV JPS BBE WBS NAS RSV)
Proverbs 5:3 For the lips of an adulteress drip honey. Her mouth is smoother than oil, (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Isaiah 41:7 And strengthen doth an artizan the refiner, A smoother 'with' a hammer, Him who is beating 'on' an anvil, Saying, 'For joining it 'is' good,' And he strengtheneth it with nails, it is not moved! (YLT)