Exodus 33:20

Overview - Exodus 33
The Lord refuses to go as he had promised with the people.
The people mourn thereat.
The tabernacle is removed out of the camp.
The Lord talks familiarly with Moses.
12 Moses prevails with God, and desires to see his glory.
Treasury of Scripture Knowledge

Exodus 33:20  (King James Version)
And he said, Thou canst not see my face: for there shall no man see me, and live.

Thou canst not
This is well explained by Rabbi Jehudah, in Sepher Cosri, (P. iv
 3.) "Of that divine glory mentioned in the Scripture, there is one degree which the eyes of the prophets were able to explore; another which all the Israelites saw, as the cloud and consuming fire; the third is so bright, and so dazzling, that no mortal is able to comprehend it; but should anyone venture to look on it, his whole frame would be dissolved." In such inconceivable splendour is the Divine Majesty revealed to the inhabitants of the celestial world, where he is said to "dwell in the light which no man can approach unto
" (1 Ti 6:16 By the "face of God," therefore, we are to understand that light inaccessible before which angels may stand, but which would be so insufferable to mortal eyes, that no man could see it and live.
24:10 Genesis 32:30 ; Deuteronomy 5:24 ; Judges 6:22 ; 13:22 Isaiah 6:5 ; John 1:18
1 Timothy 6:16 ; Hebrews 1:13 ; Revelation 1:16 Revelation 1:17