Exodus 19:14-16

New Century Version

¹⁴ After Moses went down from the mountain to the people, he made them prepare themselves for service to God, and they washed their clothes. ¹⁵ Then Moses said to the people, “Be ready in three days. Do not have sexual relations during this time.”

¹⁶ On the morning of the third day, there was thunder and lightning with a thick cloud on the mountain. There was a very loud blast from a trumpet, and all the people in the camp trembled.