Ezekiel 1:10-11

As for the likeness of their faces, they each had the face of a man [in front], and each had the face of a lion on the right side and the face of an ox on the left side; the four also had the face of an eagle [at the back of their heads]. [Rev. 4:7.] Such were their faces. And their wings were stretched out upward [each creature had four wings]; two wings of each one were touching the [adjacent] wing of the creatures on either side of it, and [the remaining] two wings of each creature covered its body.