But he sayeth the poor from the sword, from their mouth; rather, from the sword of their mouth; i.e. from their cruel and destructive words (Psalms 57:4; Psalms 64:3; Proverbs 12:18), which cut "like a sharp razor" (Psalms 52:2).
By calumny, innuendoes, lies, fraudulent representations, and the like, the ungodly work, perhaps, more injury than by their actions. And from the hand of the mighty. God delivers the poor both from their words and from their deeds.