'Out of the Heart' in the Bible

So keep watch on yourselves with care; for you saw no form of any sort on the day when the voice of the Lord came to you in Horeb out of the heart of the fire:

Has any people ever gone on living after hearing the voice of God out of the heart of the fire as you did?

Out of heaven itself his voice came to you, teaching you; and on earth he let you see his great fire; and his words came to your ears out of the heart of the fire.

The word of the Lord came to you face to face on the mountain, out of the heart of the fire,

These words the Lord said to all of you together on the mountain, out of the heart of the fire, out of the cloud and the dark, with a great voice: and he said no more; he put them in writing on the two stones of the law and gave them to me.

For what man is there in all the earth, who, hearing the voice of the living God as we have, out of the heart of the fire, has been kept from death?

And the Lord gave me the two stones with writing on them done by the finger of God: on them were recorded all the words which the Lord said to you on the mountain out of the heart of the fire, on the day of the great meeting.