The heavens declare his righteousness, for God himself is judge! Selah
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
And the heavens shall declare his righteousness. Celestial intelligences and the spirits of just men made perfect, shall magnify the infallible judgment of the divine tribunal. Now they doubtless wonder at the hypocrisy of men; then they shall equally marvel at the exactness of the severance between the true and the false. For God is judge himself. This is the reason for the correctness of the judgment.
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