David
Psalm 69:16ESV·traditional attribution

Answer me, O LORD, for your steadfast love is good; according to your abundant mercy, turn to me.

John Calvin Reformed @genevareformer

PSALM 69 There is a close resemblance between this psalm and the twenty-second. In the opening verses, David complains of the barbarous cruelty of his enemies, and of the grievous wrongs which they had inflicted upon him. The particular enemies of whom he speaks are uncertain; some referring the occasion of the composition of the psalm to his persecution by Saul, and others to the rebellion of Absalom.

Commenting on Psalm 69:1-36

C.H. Spurgeon Reformed Baptist @princeofpreachers

Hear me, O Lord. Do not refuse thy suppliant Son. It is to the covenant God, the ever living Jehovah, that he appeals with strong crying. For thy lovingkindness is good. By the greatness of thy love have pity upon thine afflicted. It is always a stay to the soul to dwell upon the preeminence and excellence of the Lord's mercy.

Matthew Henry Presbyterian @wholebiblehenry

David had been speaking before of the spiteful reproaches which his enemies cast upon him; here he adds, But, as for me, my prayer is unto thee. They spoke ill of him for his fasting and praying, and for that he was made the song of the drunkards; but, notwithstanding that, he resolves to continue praying.

Commenting on Psalm 69:13-21