In the third month after leaving Egypt, the Israelites came to the wilderness of Sinai and camped before the mountain. The Lord called to Moses from the mountain and told him to say to the house of Jacob that they had seen what he did to Egypt and how he bore them on eagles' wings and brought them to himself. If they obeyed his voice and kept his covenant, they would be his treasured possession among all peoples, a kingdom of priests and a holy nation. The elders and all the people answered together that they would do all the Lord had spoken.
The Lord said he would come to Moses in a thick cloud so that the people might hear when he spoke with him. He commanded the people to be consecrated and to wash their garments, for on the third day he would come down on the mountain in the sight of all. Moses was to set boundaries around the mountain: whoever touched it would die, with no hand touching him, stoned or shot. When the long trumpet sounded, they could go up.
On the morning of the third day there was thunder and lightning, a thick cloud on the mountain and a very loud trumpet blast, and all the people trembled. Moses brought them out to meet God, and they stood at the foot of the mountain. Mount Sinai was wrapped in smoke because the Lord had descended on it in fire, and the whole mountain shook. Moses spoke, and God answered him in thunder.
The Lord called Moses to the top and told him to go down and warn the people not to break through to gaze at the Lord, and that the priests must also consecrate themselves. Moses said the people could not come up because they had already been warned, but God told him to go down and come back with Aaron, and Moses went down to speak to the people.