John Gill Commentary Exodus 19:20

"And Jehovah came down upon mount Sinai, to the top of the mount: and Jehovah called Moses to the top of the mount; and Moses went up." — Exodus 19:20 (ASV)

And the Lord came down on Mount Sinai
In the above visible tokens of his presence and power; otherwise he is the incomprehensible Jehovah, that immense and omnipotent Being, who fills heaven and earth, and cannot be contained and circumscribed in either:

on the top of the mount ;
where the fire he descended in rested, and where the smoke and thick cloud were, as a token of his presence:

and the Lord called Moses up to the top of the mount ;
who either was at the bottom of it with the people, or in a higher ascent of it between God and them:

and Moses went up ;
to the top of it, where the Lord was, as he ordered him: a certain traveller ^F25 tells us that the top of this mount was scarce thirty feet in circumference.

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FOOTNOTES:

• F25: Baumgarten Peregrinatio, l. 1. c. 24. p. 61.