Coffman Commentaries on the Bible - Exodus 19:16-20
"And it came to pass on the third day, when it was morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of a trumpet exceeding loud; and all the people that were in the camp trembled And Moses brought forth the people out of the camp to meet God; and they stood at the nether part of the mount. And mount Sinai, the whole of it, smoked, because Jehovah descended upon it in fire; and the smoke thereof ascended as the smoke of a furnace, and the whole... read more
E.W. Bullinger's Companion Bible Notes - Exodus 19:20
on = to. went up. Moses' third ascent. read more