David
Psalm 119:2BSB·traditional attribution

Blessed are those who keep His testimonies and seek Him with all their heart.

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

Blessed are they that keep his testimonies,.... The whole word of God, the Scriptures of truth, are his testimonies: they testify of the mind of God, and of his love and grace in the method of salvation by Christ; they testify of Christ, his person, offices, and grace; of the sufferings of Christ, and the glory that should follow; and of all the happiness that...