David
Psalm 31:18ESV·traditional attribution

Let the lying lips be mute, which speak insolently against the righteous in pride and contempt.

John Calvin Reformed @genevareformer

PSALM 31. David, having been delivered from some great danger, or rather from many dangers, first relates the prayers which he had offered up to God amidst the terrors of death. He then subjoins his thanksgiving, which is no ordinary one; for he celebrates his deliverance at great length, and exhorts all the saints to be of good hope, as they had in him a...

Commenting on Psalm 31:1-24

C.H. Spurgeon Reformed Baptist @princeofpreachers

In this section of the Psalm he renews his prayers, urging the same pleas as at first: earnest wrestlers attempt over and over again the same means of gaining their point.

Commenting on Psalm 31:14

C.H. Spurgeon Reformed Baptist @princeofpreachers

Let the lying lips be put to silence. A right good and Christian prayer; who but a bad man would give liars more license than need be? May God silence them either by leading them to repentance, by putting them to thorough shame, or by placing them in positions where what they may say will stand for nothing. Which speak grievous things proudly and contemptuously against the righteous.