Exodus Chapter 19, Verse 19
From BibleWiki
19: And when the voice of the trumpet sounded long, and waxed
louder and louder, Moses spake, and God answered him by a
voice.
19: And the sound of the trumpet grew by degrees louder and louder,
and was drawn out to a greater length: Moses spoke, and God answered
him.
19: And the sounds of the trumpet were waxing very much louder. Moses spoke, and God answered him with a voice.
Exodus Chapter 19, Verse 19/commentary

