'Smoother' in the Bible

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.

For the lips of a strange woman drop as an honeycomb, and her mouth is smoother than oil:

And strengthen doth an artisan 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!