And they bend their tongues like their bow for lies: but they are not valiant for the truth upon the earth; for they proceed from evil to evil, and they know not me, saith the LORD. They bend their tongues like their bow for lies - i:e., with lies as their arrows; they direct lies on their tongue as their bow (Psalms 64:3-4, "Who whet their tongue like a sword, and bend their bows to shoot their arrows, even bitter words").
Not valiant for the truth - (Jeremiah 7:28). Maurer translates, 'They do not prevail by truth' or faith (Psalms 12:4, "With our tongue will we prevail"). Their tongue, not faith, is their weapon.
Upon the earth - rather, 'in the land.'
They know not me - (Hosea 4:1, "There is no knowledge of God in the land").