David
Psalm 81:8ESV·traditional attribution

Hear, O my people, while I admonish you! O Israel, if you would but listen to me!

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

Hear, O my people, and I will testify unto thee. What? Are the people so insensible as to be deaf to their God? So it would seem, for he earnestly asks a hearing. Are we not also at times quite as careless and immovable? O Israel, if thou wilt hearken unto me. There is much in this "if." How low have they fallen who will not hearken unto God himself!

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