Moses
Psalm 119:11ESV·traditional attribution

I have stored up your word in my heart, that I might not sin against you.

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

Here is, 1. The close application which David made of the word of God to himself: He hid it in his heart, laid it up there, that it might be ready to him whenever he had occasion to use it; he laid it up as that which he valued highly, and had a warm regard for, and which he was afraid of losing and being robbed of.

John Gill Reformed Baptist @doctorgill

Blessed art thou, O Lord,.... In himself, in his nature, persons, and perfections; the fountain of all happiness to angels and men, in time and to eternity; to whom all blessing, honour, and glory, are to be given. The psalmist takes this method of praising and ascribing blessing to God, for what he had received from him; particularly for teaching him what he had learned...