Moses
Psalm 89:18BSB·traditional attribution

Surely our shield belongs to the LORD, and our king to the Holy One of Israel.

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 the Lord is our defence. Whoever else may defend us, he is our ultimate Defender and Shield. And the Holy one of Israel is our king. He who protects should govern, our defender should be acknowledged as our king. Kings are called the shields of nations, and the God of Israel is both our Ruler and our Defence.

Matthew Henry Presbyterian @wholebiblehenry

The psalmist, having largely shown the blessedness of the God of Israel, here shows the blessedness of the Israel of God. As there is none like unto the God of Jeshurun, so, happy art thou, O Israel! there is none like unto thee, O people! especially as a type of the gospel-Israel, consisting of all true believers, whose happiness is here described. I.

Commenting on Psalm 89:15-18