Ezekiel 1:22-24

Over the heads of the living creatures there was the likeness of an expanse, shining like awe-inspiring crystal, spread out above their heads. And under the expanse their wings were stretched out straight, one toward another. And each creature had two wings covering its body. And when they went, I heard the sound of their wings like the sound of many waters, like the sound of the Almighty, a sound of tumult like the sound of an army. When they stood still, they let down their wings.

English Standard Version (ESV)