Moses
Psalm 89:2BSB·traditional attribution

For I have said, “Loving devotion is built up forever; in the heavens You establish Your 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

For I have said, Mercy shall be built up for ever. His heart was persuaded of it, and he had affirmed it as an indisputable truth. He was certain that upon a sure foundation the Lord intended to pile up a glorious palace of goodness—a house of refuge for all people, wherein the Son of David should for ever be glorified as the dispenser of heavenly grace.

Matthew Henry Presbyterian @wholebiblehenry

The psalmist has a very sad complaint to make of the deplorable condition of the family of David at this time, and yet he begins the psalm with songs of praise; for we must, in every thing, in every state, give thanks; thus we must glorify the Lord in the fire.

Commenting on Psalm 89:1-4