Exodus 24:9-11, 15-17

Then they climbed the mountain—Moses and Aaron, Nadab and Abihu, and seventy of the elders of Israel—and saw the God of Israel. He was standing on a pavement of something like sapphires—pure, clear sky-blue. He didn’t hurt these pillar-leaders of the Israelites: They saw God; and they ate and drank.

Then Moses climbed the mountain. The Cloud covered the mountain. The Glory of GOD settled over Mount Sinai. The Cloud covered it for six days. On the seventh day he called out of the Cloud to Moses. In the view of the Israelites below, the Glory of GOD looked like a raging fire at the top of the mountain.