Albert Barnes Commentary Psalms 50:2

"Out of Zion, the perfection of beauty, God hath shined forth." — Psalms 50:2 (ASV)

Out of Zion - The place where God was worshipped, and where he dwelt. Compare the notes at Isaiah 2:3.

The perfection of beauty - See the notes at Psalms 48:2.

God has shined - Has shined forth, or has caused light and splendor to appear. Compare Deuteronomy 33:2; Psalms 80:2; Psalms 94:1 (see the margin).

The meaning here is that the great principles that are to determine the destiny of mankind in the final judgment are those that proceed from Zion; or, those that are taught in the religion of Zion; they are those that are inculcated through the church of God. God has there made known his law; he has stated the principles on which he governs, and on which he will judge the world.