David
Psalm 1:1ESV·traditional attribution

Blessed is the man who walks not in the counsel of the wicked, nor stands in the way of sinners, nor sits in the seat of scoffers;

John Calvin Reformed @genevareformer

Commentary upon the book of Psalms PSALM 1. He who collected the Psalms into one volume, whether Ezra or some other person, appears to have placed this Psalm at the beginning, by way of preface, in which he inculcates upon all the godly the duty of meditating upon the law of God.

Commenting on Psalm 1:1-6

C.H. Spurgeon Reformed Baptist @princeofpreachers

Blessed— see how this Book of Psalms opens with a benediction, even as did the famous Sermon of our Lord upon the Mount! The word translated "blessed" is a very expressive one. The original word is plural, and it is a controverted matter whether it is an adjective or a substantive.

Commenting on Psalm 1:1

Matthew Henry Presbyterian @wholebiblehenry

The psalmist begins with the character and condition of a godly man, that those may first take the comfort of that to whom it belongs. Here is, I. A description of the godly man's spirit and way, by which we are to try ourselves.

Commenting on Psalm 1:1-3