Exodus 19:21

¹⁹And when the voice of the trumpet sounded long, and waxed louder and louder, Moses spake, and God answered him by a voice.

²⁰And the LORD came down upon mount Sinai, on the top of the mount: and the LORD called Moses up to the top of the mount; and Moses went up.

— Exodus 19:21 —

²²And let the priests also, which come near to the LORD, sanctify themselves, lest the LORD break forth upon them.

²³And Moses said unto the LORD, The people cannot come up to mount Sinai: for thou chargedst us, saying, Set bounds about the mount, and sanctify it.