Exodus 19:16-20

On the third day at daybreak, there were loud claps of thunder, flashes of lightning, a thick cloud covering the mountain, and an ear-piercing trumpet blast. Everyone in the camp shuddered in fear. Moses led the people out of the camp to meet God. They stood at attention at the base of the mountain. Mount Sinai was all smoke because GOD had come down on it as fire. Smoke poured from it like smoke from a furnace. The whole mountain shuddered and heaved. The trumpet blasts grew louder and louder. Moses spoke and God answered in thunder. GOD descended to the peak of Mount Sinai. GOD called Moses up to the peak and Moses climbed up.