David
Psalm 30:10ESV·traditional attribution

Hear, O LORD, and be merciful to me! O LORD, be my helper!”

John Calvin Reformed @genevareformer

PSALM 30. David having been delivered from great danger, not only renders thanks to God apart by himself, but at the same time invites and exhorts all the pious to perform the same duty. He then confesses that he had flattered himself too confidently in his prosperity, and that his security had justly been chastised. In the third place, having briefly expressed his sorrow, he returns again to thanksgiving.

Commenting on Psalm 30:1-12

C.H. Spurgeon Reformed Baptist @princeofpreachers

Hear, O Lord, and have mercy upon me. A short and comprehensive petition, available at all seasons, let us use it full often. It is the publican's prayer; be it ours. If God hears prayer, it is a great act of mercy; our petitions do not merit a reply. Lord, be thou my helper. Another compact, expressive, ever fitting prayer.

Matthew Henry Presbyterian @wholebiblehenry

We have, in these verses, an account of three several states that David was in successively, and of the workings of his heart towards God in each of those states - what he said and did, and how his heart stood affected; in the first of these we may see what we are too apt to be, and in the other two what we should be. I.

Commenting on Psalm 30:6-12