Exodus 19:15 KJV

13There shall not an hand touch it, but he shall surely be stoned, or shot through; whether it be beast or man, it shall not live: when the trumpet soundeth long, they shall come up to the mount.

14And Moses went down from the mount unto the people, and sanctified the people; and they washed their clothes.

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

16And 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 was in the camp trembled.

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