21 The people stayed at a distance, and Moses came near to the thick darkness where God was.
Exodus 20:21 Cross References - WEB
Exodus 19:16-17
16 On the third day, when it was morning, there were thunders and lightnings, and a thick cloud on the mountain, and the sound of an exceedingly loud trumpet; and all the people who were in the camp trembled.
17 Moses led the people out of the camp to meet God; and they stood at the lower part of the mountain.
Deuteronomy 5:5
5 (I stood between Yahweh and you at that time, to show you Yahweh’s word; for you were afraid because of the fire, and didn’t go up onto the mountain) saying,
Deuteronomy 5:22
22 Yahweh spoke these words to all your assembly on the mountain out of the middle of the fire, of the cloud, and of the thick darkness, with a great voice. He added no more. He wrote them on two stone tablets, and gave them to me.
1 Kings 8:12
12 Then Solomon said, “Yahweh has said that he would dwell in the thick darkness.
2 Chronicles 6:1
1 Then Solomon said, “Yahweh has said that he would dwell in the thick darkness.
Psalms 18:9
9 He bowed the heavens also, and came down. Thick darkness was under his feet.
Psalms 18:12
12 At the brightness before him his thick clouds passed, hailstones and coals of fire.
Psalms 97:2
2 Clouds and darkness are around him. Righteousness and justice are the foundation of his throne.
Psalms 104:2
2 He covers himself with light as with a garment. He stretches out the heavens like a curtain.
1 Timothy 6:16
16 He alone has immortality, dwelling in unapproachable light, whom no man has seen, nor can see: to whom be honor and eternal power. Amen.