Exodus 24:10, 16
Exodus 24:10 NASB1995
and they saw the God of Israel; and under His feet there appeared to be a pavement of sapphire, as clear as the sky itself.
Exodus 24:16 NASB1995
The glory of the LORD rested on Mount Sinai, and the cloud covered it for six days; and on the seventh day He called to Moses from the midst of the cloud.