Ezekiel 1:5, 22, 26

And out of the midst thereof came the likeness of four living creatures. And this was their appearance: they had the likeness of a man

And over the head of the living creature there was the likeness of a firmament, like the terrible crystal to look upon, stretched forth over their heads above.

And above the firmament that was over their heads was the likeness of a throne, as the appearance of a sapphire stone; and upon the likeness of the throne was a likeness as the appearance of a man upon it above.