“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.”
King James Version (KJV)
1:22 Likeness - The appearance or resemblance. As crystal - For splendor, purity, and solidity, all that was above these creatures and wheels was beautiful and very majestic, and 'tis therefore called terrible, because it impressed a veneration upon the mind of the beholders.