David
Psalm 50:1ESV·traditional attribution

The Mighty One, God the LORD, speaks and summons the earth from the rising of the sun to its setting.

John Calvin Reformed @genevareformer

PSALM 50 There have always been hypocrites in the Church, men who have placed religion in a mere observance of outward ceremonies, and among the Jews there were many who turned their attention entirely to the figures of the Law, without regarding the truth which was represented under them. They conceived that nothing more was demanded of them but their sacrifices and other rites.

Commenting on Psalm 50:1-23

C.H. Spurgeon Reformed Baptist @princeofpreachers

The mighty God, even the Lord. El, Elohim, Jehovah, three glorious names for the God of Israel. To render the address the more impressive, these august titles are mentioned, just as in royal decrees the names and dignities of monarchs are placed in the forefront. Here the true God is described as Almighty, as the only and perfect object of adoration and as the self existent One.

Matthew Henry Presbyterian @wholebiblehenry

It is probable that Asaph was not only the chief musician, who was to put a tune to this psalm, but that he was himself the penman of it; for we read that in Hezekiah's time they praised God in the words of David and of Asaph the seer, Ch2 29:30. Here is, I.

Commenting on Psalm 50:1-6