David
Psalm 55:4ESV·traditional attribution

My heart is in anguish within me; the terrors of death have fallen upon me.

John Calvin Reformed @genevareformer

4. My heart trembles within me “My heart is in travail within me.” חול, “de tremore maxime parturientium.” — Fry Ainsworth reads, “My heart is pained within me, or trembleth with pain.” “The word,” says he, “usually meaneth such pains as a woman feeleth in her travail.” Here we have additional evidence of the extremity of David’s sufferings.

C.H. Spurgeon Reformed Baptist @princeofpreachers

My heart is sore pained within me. His spirit writhed in agony, like a poor worm; he was mentally as much in pain as a woman in travail physically. His inmost soul was touched; and a wounded spirit who can bear? If this were written when David was attacked by his own favourite son, and ignominiously driven from his capital, he had reason enough for using these expressions.

Matthew Henry Presbyterian @wholebiblehenry

In these verses we have, I. David praying. Prayer is a salve for every sore and a relief to the spirit under every burden: Give ear to my prayer, O God! Psa 55:1, Psa 55:2. He does not set down the petitions he offered up to God in his distress, but begs that God would hear the prayers which, at every period, his heart lifted...

Commenting on Psalm 55:1-8