Berean Study Bible (BSB) - Psalms 55:21 >

His speech is smooth as butter, but war is in his heart. His words are softer than oil, yet they are swords unsheathed.

Jewish Publication Society of America Version (JPS1917) - Psalms 55:21 >

(55-22) Smoother than cream were the speeches of his mouth, but his heart was war; his words were softer than oil, yet were they keen-edged swords.