Exodus 19:14-17

ASV(i) 14 And Moses went down from the mount unto the people, and sanctified the people; and they washed their garments. 15 And he said unto the people, Be ready against the third day: come not near a woman.
16 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. 17 And Moses brought forth the people out of the camp to meet God; and they stood at the nether part of the mount.