TSK · Exodus 18:5

Now Moses was shepherding the flock of his father-in-law Jethro, the priest of Midian, and he led the flock to the far side of the desert and came to the mountain of God, to Horeb.

and 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.

The glory of the LORD resided on Mount Sinai, and the cloud covered it for six days. On the seventh day he called to Moses from within the cloud.