Exodus 20:18-22 AMPC
Now all the people perceived the thunderings and the lightnings and the noise of the trumpet and the smoking mountain, and as [they] looked they trembled with fear and fell back and stood afar off.
And they said to Moses, You speak to us and we will listen, but let not God speak to us, lest we die.
And Moses said to the people, Fear not; for God has come to prove you, so that the [reverential] fear of Him may be before you, that you may not sin.
And the people stood afar off, but Moses drew near to the thick darkness where God was.
And the Lord said to Moses, Thus shall you say to the Israelites, You have seen for yourselves that I have talked with you from heaven.
AMPC: Amplified Bible, Classic Edition