Exodus 19:15-17 Easy-to-Read Version (ERV)
15 Then Moses said to the people, “Be ready for the meeting with God in three days. Until that time do not have sexual relations.”
16 On the morning of the third day, a thick cloud came down onto the mountain. There was thunder and lightning and a very loud sound from a trumpet. All the people in the camp were frightened. 17 Then Moses led the people out of the camp to a place near the mountain to meet God.