Exodus 19:17 WBT

¹⁵  And he said to the people, Be ready against the third day: come not at [your] wives.

¹⁶  And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that [were] in the camp trembled.

¹⁷  And Moses brought forth the people out of the camp to meet with God; and they stood at the nether part of the mount.

¹⁸  And mount Sinai was altogether in a smoke, because the LORD descended upon it in fire: and the smoke of it ascended as the smoke of a furnace, and the whole mount trembled greatly.

¹⁹  And when the voice of the trumpet sounded long, and grew louder and louder, Moses spoke, and God answered him by a voice.