Exodus 19:3, 20, 23

Then Moses went up to God, and the LORD called to him from the mountain and said, “This is what you are to say to the descendants of Jacob and what you are to tell the people of Israel

The LORD descended to the top of Mount Sinai and called Moses to the top of the mountain. So Moses went up

Moses said to the LORD, “The people cannot come up Mount Sinai, because you yourself warned us, ‘Put limits around the mountain and set it apart as holy.’ ”