Deuteronomy 4:33

4:33 Have a people ever heard the voice of God speaking from the middle of fire, as you yourselves have, and lived to tell about it?

Exodus 19:9

19:9 The Lord said to Moses, “I am going to come to you in a dense cloud, so that the people may hear when I speak with you and so that they will always believe in you.” And Moses told the words of the people to the Lord.

Exodus 19:19

19:19 When the sound of the horn grew louder and louder, Moses was speaking and God was answering him with a voice.

Exodus 20:18-22

20:18 All the people were seeing the thundering and the lightning, and heard the sound of the horn, and saw the mountain smoking – and when the people saw it they trembled with fear and kept their distance. 20:19 They said to Moses, “You speak to us and we will listen, but do not let God speak with us, lest we die.” 20:20 Moses said to the people, “Do not fear, for God has come to test you, that the fear of him may be before you so that you do not sin.” 20:21 The people kept their distance, but Moses drew near the thick darkness where God was.

The Altar

20:22 The Lord said to Moses: “Thus you will tell the Israelites: ‘You yourselves have seen that I have spoken with you from heaven.

Exodus 24:16

24:16 The glory of the Lord resided on Mount Sinai, and the cloud covered it for six days. On the seventh day he called to Moses from within the cloud.

Nehemiah 9:13

9:13 “You came down on Mount Sinai and spoke with them from heaven. You provided them with just judgments, true laws, and good statutes and commandments.

Hebrews 12:18

12:18 For you have not come to something that can be touched, to a burning fire and darkness and gloom and a whirlwind

Hebrews 12:25

12:25 Take care not to refuse the one who is speaking! For if they did not escape when they refused the one who warned them on earth, how much less shall we, if we reject the one who warns from heaven?