David
Psalm 103:3ESV·traditional attribution

who forgives all your iniquity, who heals all your diseases,

John Calvin Reformed @genevareformer

PSALM 103 By this psalm every godly man is taught to give thanks to God for the mercies bestowed upon himself in particular, and then for the grace which God has vouchsafed to all his chosen ones in common, by making a covenant of salvation with them in his law, that he might make them partakers of his adoption.

Commenting on Psalm 103:1-22

C.H. Spurgeon Reformed Baptist @princeofpreachers

Who forgiveth all thine iniquities. Here David begins his list of blessings received, which he rehearses as themes and arguments for praise. He selects a few of the choicest pearls from the casket of divine love, threads them on the string of memory, and hangs them about the neck of gratitude.

Matthew Henry Presbyterian @wholebiblehenry

David is here communing with his own heart, and he is no fool that thus talks to himself and excites his own soul to that which is good. Observe, I. How he stirs up himself to the duty of praise, Psa 103:1, Psa 103:2. 1.

Commenting on Psalm 103:1-5