NET
21 His words are as smooth as butter, but he harbors animosity in his heart. His words seem softer than oil, but they are really like sharp swords.
Darby
21 Smooth were the milky [words] of his mouth, but his heart was war; his words were softer than oil, yet are they drawn swords.
KJV
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.