So here are three parts of the mount manifestly distinguished; the top, where the cloud was; the middle part, where Moses now stood, and about which the bounds seem to have been put; and the nether or lower part, where the people were.
Related Commentaries of Exodus 19:20
Exodus 19:20
20 And 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.