Exodus 19:18-19

18Now aMount Sinai was wrapped in smoke because the Lord had descended on it in fire. The smoke of it went up like the smoke of a kiln, and bthe whole mountain trembled greatly. 19And as the csound of the trumpet grew louder and louder, Moses spoke, and dGod answered him in thunder.

Deuteronomy 4:12-15

12Then ethe Lord spoke to you out of the midst of the fire. You heard the sound of words, fbut saw no form; gthere was only a voice. 13 hAnd he declared to you his covenant, which he commanded you to perform, that is, ithe Ten Commandments,
Hebrew words
kand he wrote them on two tablets of stone.
14And lthe Lord commanded me at that time to teach you statutes and rules, that you might do them in the land that you are going over to possess.

Idolatry Forbidden

15 m“Therefore watch yourselves very carefully. Since nyou saw no form on the day that the Lord spoke to you at Horeb out of the midst of the fire,

Deuteronomy 4:36

36 oOut of heaven he let you hear his voice, that he might discipline you. And on earth he let you see his great fire, and pyou heard his words out of the midst of the fire.

Deuteronomy 5:4

4The Lord spoke with you qface to face at the mountain, out of the midst of the fire,
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