Exodus 19:11, 20
Exodus 19:11 NASB1995
and let them be ready for the third day, for on the third day the LORD will come down on Mount Sinai in the sight of all the people.
Exodus 19:20 NASB1995
The LORD came down on Mount Sinai, to the top of the mountain; and the LORD called Moses to the top of the mountain, and Moses went up.