And they had the hands of a man under their wings on their four sides; and the four had their faces and their wings.
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George Leo Haydock
Wings. Their arms were covered with feathers, and the hand appeared at the extremity; or they had four arms under the wings, chap. x. 8. They all came from the shoulders, so as to correspond with the four faced animal, ver. 6. (Calmet)
Others believe that each face had four wings, so that the animal would have sixteen. (Maldon at)
In Isaias ix. 2., the cherub has six wings. The form was variable, as there was nothing in nature similar. They were perhaps designed to represent the eternity and dominion of God over the whole creation, ver. 28. (Haydock)