Moses
Psalm 89:13BSB·traditional attribution

Mighty is Your arm; strong is Your hand. Your right hand is exalted.

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

Thou hast a mighty arm, omnipotence is thine in smiting or uplifting; strong is thy hand, thy power to create and grasp is beyond conception great; and high is thy right hand—thy skill is incomparable, thy favour ennobling, thy working glorious.

Matthew Henry Presbyterian @wholebiblehenry

These verses are full of the praises of God. Observe, I. Where, and by whom, God is to be praised. 1. God is praised by the angels above: The heavens shall praise thy wonders, O Lord! Psa 89:5; that is, "the glorious inhabitants of the upper world continually celebrate thy praises." Bless the Lord, you his angels, Psa 103:20.

Commenting on Psalm 89:5-14