Exodus 24:10

and saw the God of Israel. Under his feet was something like a pavement made of sapphire, clear as the sky itself.

(New International Version)

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.

(New American Standard Bible)

And they saw the God of Israel: and there was under his feet as it were a paved work of a sapphire stone, and as it were the body of heaven in his clearness.

(King James Version)