ASV

And it came to pass, when ye heard the voice out of the midst of the darkness, while the mountain was burning with fire, that ye came near unto me, even all the heads of your tribes, and your elders;

KJV

And it came to pass, when ye heard the voice out of the midst of the darkness, (for the mountain did burn with fire,) that ye came near unto me, even all the heads of your tribes, and your elders;