Deuteronomy 4:12

4:12 Then the Lord spoke to you from the middle of the fire; you heard speech but you could not see anything – only a voice was heard. ¹ 

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?

Deuteronomy 5:23

5:23 Then, when you heard the voice from the midst of the darkness while the mountain was ablaze, all your tribal leaders and elders approached me.

Deuteronomy 5:25

5:25 But now, why should we die, because this intense fire will consume us! If we keep hearing the voice of the Lord our God we will die!

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¹ tn The words “was heard” are supplied in the translation to avoid the impression that the voice was seen.