אַרְבָּעָ֨ה אַרְבָּעָ֤ה פָנִים֙ לְאֶחָ֔ד וְאַרְבַּ֥ע כְּנָפַ֖יִם לְאֶחָ֑ד וּדְמוּת֙ יְדֵ֣י אָדָ֔ם תַּ֖חַת כַּנְפֵיהֶֽם׃
Every one had four faces apiece, and every one four wings; and the likeness of the hands of a man was under their wings.
Read midrashic interpretation of Ezekiel 10:21: and classical rabbinic exegesis.