Ezekiel 1:22 in the King James Version
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.
Context
21 When those went, these went. When those stood, these stood. When those were lifted up from the earth, the wheels were lifted up beside them; for the spirit of the living creature was in the wheels.
22 Over the head of the living creature there was the likeness of an expanse, like an awesome crystal to look at, stretched out over their heads above.
23 Under the expanse, their wings were straight, one toward the other. Each one had two which covered on this side, and each one had two which covered their bodies on that side.