Ezekiel 1:6

He now comes to the heads and wings themselves. Many suppose that each animal had four heads, and then that four appearances belonged to each head; others extend the wings much further, because they assign four wings to each of the four heads, and others even sixteen; but this does not seem in accordance with the Prophet’s words. He simply says each had four heads, and then four wings. The wings and the heads correspond; but one animal was endowed with only four heads, and so I do not think that it had more than four wings, which will again be evident from the context. He adds afterwards —