New Defender's Study Bible Notes
64:3 whet their tongue. The tongue with its bitter words is compared to a sword, to arrows, and to a whetted razor. The tongue can be “a fire, a world of iniquity,” set “on fire of hell” (James 3:6). A major weapon of the enemies of God is the use of lying words, deceitful words, angry words. The main defensive weapon is the Word, with its words of truth and peace.