Ezekiel 1:22-25

Now over the heads of the living beings there was something like an expanse, like the awesome gleam of crystal, spread out over their heads. Under the expanse their wings were stretched out straight, one toward the other; each one also had two wings covering its body on the one side and on the other. I also heard the sound of their wings like the sound of abundant waters as they went, like the voice of the Almighty, a sound of tumult like the sound of an army camp; whenever they stood still, they dropped their wings. And there came a voice from above the expanse that was over their heads; whenever they stood still, they dropped their wings.