Psalms 64:3

3 For they have whetted their tongue like a sword His enemies, in their rage, aimed at nothing less than his life, and yet what he complains of, more than all beside, is the poison with which their words were imbued. It is probable that he refers to the calumnious reports which he knew to be falsely spread to his discredit, and with a view of damaging his reputation with the people. Their tongues he likens to swords; their bitter and venomous words to arrows. And when he adds, that, they shoot against the upright and innocent, he is to be considered as contrasting his integrity with their unprincipled conduct. It inspired him with confidence in his religious addresses, to know that he could exonerate his own conscience from guilt, and that he was the object of undeserved attack by worthless and abandoned men. In mentioning that they shoot secretly and suddenly, he refers to the craft which characterised them. They were not only eagerly bent upon mischief, and intent in watching their opportunities, but so expert and quick in their movements, as to smite their victim before he could suspect danger. When we hear that David, who was a man in every respect so much more holy and upright in his conduct than ourselves, suffered from groundless aspersions upon his character, we have no reason to be surprised that we should be exposed to a similar trial. This comfort, at least, we always have, that we can betake ourselves to God, and obtain his defense of the upright cause. He takes particular notice of another circumstance, that they shot their empoisoned arrows from their lips without fear, or shame. This self-secure spirit argued a degree of abandoned presumption, in so far as they could persist in obstinately pursuing the conduct in which they had been repeatedly detected, and renew their desperate attempts, to the disregard of all fear of God or worldly shame.