Moses
Exodus 34:6ESV·traditional attribution

The LORD passed before him and proclaimed, “The LORD, the LORD, a God merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness,

Matthew Henry Presbyterian @wholebiblehenry

No sooner had Moses got to the top of the mount than God gave him the meeting (Exo 34:5): The Lord descended, by some sensible token of his presence, and manifestation of his glory. His descending bespeaks his condescension; he humbles himself to take cognizance of those that humble themselves to walk with him. Psa 113:6, Lord, what is man, that he should be thus visited?

Commenting on Exodus 34:5-9

John Gill Reformed Baptist @doctorgill

And the Lord passed by before him,.... Or caused his Shechinah, his divine Majesty, and the glory of it, to pass before him, as the Targums; his glory and goodness, which he had promised should pass before him, Exo 33:19 and it is but a transient passing view the greatest of men, God's peculiar favourites, have of him in this life: and proclaimed, the Lord...

Jamieson-Fausset-Brown Reformed @jfbcommentary

the Lord passed by before him--in this remarkable scene, God performed what He had promised to Moses the day before. proclaimed, The Lord . . . merciful and gracious--At an earlier period He had announced Himself to Moses, in the glory of His self-existent and eternal majesty, as "I am" [Exo 3:14]; now He makes Himself known in the glory of His grace and goodness--attributes...