David
Psalm 81:13ESV·traditional attribution

Oh, that my people would listen to me, that Israel would walk in my ways!

John Calvin Reformed @genevareformer

PSALM 81 This psalm consists of two parts. Whoever was its author, he exhorts the people to remember the unparalleled grace of God towards them, in delivering them by his outstretched arm, and choosing them to be a kingdom of priests, and a peculiar Church to himself; that thus they may be excited devoutly to honor their deliverer, both by celebrating his praises, and by leading a holy life.

Commenting on Psalm 81:1-16

C.H. Spurgeon Reformed Baptist @princeofpreachers

O that my people had hearkened unto me, and Israel had walked in my ways! The condescending love of God expresses itself in painful regrets for Israel's sin and punishment. Such were the laments of Jesus over Jerusalem. Certain doctrinalists find a stumbling stone in such passages, and set themselves to explain them away, but to men in sympathy with the divine nature the words...

Matthew Henry Presbyterian @wholebiblehenry

God, by the psalmist, here speaks to Israel, and in them to us, on whom the ends of the world are come. I. He demands their diligent and serious attention to what he was about to say (Psa 81:8): "Hear, O my people! and who should hear me if my people will not? I have heard and answered thee; now wilt thou hear me?

Commenting on Psalm 81:8-16