Isaiah 6:2
1 In the year of King Uzziah’s death, I saw the Lord seated on a high, elevated throne. The hem of his robe filled the temple. 2 Seraphs stood over him; each one had six wings. With two wings they covered their faces, with two they covered their feet, and they used the remaining two to fly. 3 They called out to one another, “Holy, holy, holy is the Lord of Heaven’s Armies! His majestic splendor fills the entire earth!” 4 The sound of their voices shook the door frames, and the temple was filled with smoke.
1 Enoch 14:20
19 And the Great Glory sat thereon, and His raiment shone more brightly than the sun and was whiter than any snow. 20 None of the angels could enter and could behold His face by reason of the magnificence and glory and no flesh could behold Him. 21 The flaming fire was round about Him, and a great fire stood before Him, and none around could draw nigh Him: ten thousand times ten thousand (stood) before Him, yet He needed no counselor. 22 And the most holy ones who were nigh to Him did not leave by night nor depart from Him.
Notes and References
"... The description appears to intentionally take readers to the idea that no one could behold the unveiled, unfiltered presence of God. In Exodus 33:20, this privilege was denied to Moses. In Isaiah 6, the seraphim cover their faces in God’s presence (Isaiah 6:2). I say “unveiled, unfiltered” because God does appear to humans as a man in the Old Testament, most often as the Angel of Yahweh, where no indication is given that the conversations are not face to face (Genesis 18; 32:22–32; compare Genesis 48:15–16) ..."
Heiser, Michael S. A Companion to the Book of Enoch: A Reader’s Commentary, Vol. 1 (p. 152) Defender Publishing, 2019