Exodus 24:1; Exodus 24:9-10
Then he said to Moses, "Come up to the LORD, you and Aaron, Nadab and Abihu, and seventy of the elders of Israel. You are to worship at a distance,
Moses and Aaron, Nadab and Abihu, and the seventy elders of Israel went up
and saw the God of Israel. Under his feet was something like a pavement made of sapphire, clear as the sky itself.