Ezekiel 1:15
"Now as I beheld the living creatures, behold one wheel upon the earth by the living creatures, with his four faces."
Cross References (ranked by relevance)
I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool: his throne was like the fiery flame, and his wheels as burning fire.
And when I looked, behold the four wheels by the cherubims, one wheel by one cherub, and another wheel by another cherub: and the appearance of the wheels was as the colour of a beryl stone.
And every one had four faces, and every one had four wings.
And the first beast was like a lion, and the second beast like a calf, and the third beast had a face as a man, and the fourth beast was like a flying eagle.