Ezekiel 1:5, 22, 26

Also 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 the likeness of the firmament upon the heads of the living creature was as the colour of the terrible crystal, 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 the likeness as the appearance of a man above upon it.