Albert Barnes Commentary Ezekiel 1:10

"As for the likeness of their faces, they had the face of a man; and they four had the face of a lion on the right side; and they four had the face of an ox on the left side; they four had also the face of an eagle." — Ezekiel 1:10 (ASV)

Each living creature had four faces—in front, the face of a man, that of a lion on the right side, that of an ox on the left side, and that of an eagle behind—and the “chariot” would present to the beholder two faces of a man, of a lion, of an eagle, and of an ox, according to the quarter from which he looked upon it.