Псалтирь 64:3

This whole psalm has reference to David's enemies, persecutors, and slanderers; many such there were, and a great deal of trouble they gave him, almost all his days, so that we need not guess at any particular occasion of penning this psalm. I. He prays to God to preserve him from their malicious designs against him (Psa 64:1, Psa 64:2). II. He gives a very bad character of them, as men marked for ruin by their own wickedness (Psa 64:3-6). III. By the spirit of prophecy he foretels their destruction, which would redound to the glory of God and the encouragement of his people (Psa 64:7-10). In singing this psalm we must observe the effect of the old enmity that is in the seed of the woman against the seed of the serpent, and assure ourselves that the serpent's head will be broken, at last, to the honour and joy of the holy seed. To the chief musician. A psalm of David.

64:3 their tongues . . . bitter words: Liars use their speech to kill. This description might also refer to practicing magic.