Charles Ellicott Commentary Psalms 64:3

"Who have whet their tongue like a sword, And have aimed their arrows, even bitter words," — Psalms 64:3 (ASV)

For the figure in this and the following verse, see Psalms 10:7; Psalms 11:2; Psalms 52:2; Psalms 57:4; Psalms 59:7.

“It is slander.
Whose edge is sharper than the sword.”

SHAKESPEARE.

For the ellipse in “they bend (literally, tread) their arrows,” see Psalms 58:7.