David
Psalm 89:33BSB·traditional attribution

But I will not withdraw My loving devotion from him, nor ever betray My faithfulness.

John Calvin Reformed @genevareformer

PSALM 89 The prophet who wrote this psalm, whoever he was, in approaching the throne of grace to make supplication to God in behalf of the afflicted Church, lays down, as an encouragement both to himself and the rest of the faithful to cherish good hope, the covenant which God had made with David.

Commenting on Psalm 89:1-52

C.H. Spurgeon Reformed Baptist @princeofpreachers

Nevertheless. And a glorious nevertheless too! Nevertheless my lovingkindness will I not utterly take from him. O glorious fear killing sentence! This crowns the covenant with exceeding glory. Mercy may seem to depart from the Lord's chosen, but it shall never altogether do so.

Matthew Henry Presbyterian @wholebiblehenry

The covenant God made with David and his seed was mentioned before (Psa 89:3, Psa 89:4); but in these verses it is enlarged upon, and pleaded with God, for favour to the royal family, now almost sunk and ruined; yet certainly it looks at Christ, and has its accomplishment in him much more than in David; nay, some passages here are scarcely applicable at all...

Commenting on Psalm 89:19-37