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. (Verses like Psalms 55:21)
Proverbs 15:1 - A soft answer turneth away wrath: but grievous words stir up anger. (Verses like Proverbs 15:1)
Proverbs 18:23 - The poor useth intreaties; but the rich answereth roughly. (Verses like Proverbs 18:23)
Proverbs 25:15 - By long forbearing is a prince persuaded, and a soft tongue breaketh the bone. (Verses like Proverbs 25:15)
Isaiah 30:10 - Which say to the seers, See not; and to the prophets, Prophesy not unto us right things, speak unto us smooth things, prophesy deceits: (Verses like Isaiah 30:10)