David
Psalm 119:1ESV·traditional attribution

Blessed are those whose way is blameless, who walk in the law of the LORD!

John Calvin Reformed @genevareformer

PSALM 119 As this psalm treats of various matters, it is difficult to give an epitome of its contents. There are, however, two things which the prophet mainly aims at; the exhorting of the children of God to follow godliness and a holy life; and the prescribing of the rule, and pointing out the form of the true worship of God, so that the faithful...

Commenting on Psalm 119:1-176

Matthew Henry Presbyterian @wholebiblehenry

The psalmist here shows that godly people are happy people; they are, and shall be, blessed indeed. Felicity is the thing we all pretend to aim at and pursue. He does not say here wherein it consists; it is enough for us to know what we must do and be that we may attain to it, and that we are here told.

Commenting on Psalm 119:1-3

John Gill Reformed Baptist @doctorgill

ALEPH.--The First Part. ALEPH. Blessed are the undefiled in the way,.... Who are in the right way to heaven and happiness, which is Jesus Christ; the strait gate, and narrow way to eternal life; the only true way of life and salvation, in which way believers walk by faith.