זוהר שמות — דף מג ע”א

The seven lower sefirot are Gedullah, Gevurah, Tiferet, Netzach, Hod, Yesod and Malkhut. God calls Himself by the names of His attributes in each sefirah. Yesod is the Tzaddik, and in it all worlds are sustained. Samael and his cohorts serve as servants to the angels, like clouds. The Egyptians saw their guardian angel as a horse under God's chariot, and Egypt's idols were immediately shaken. The redemption of the firstborn donkey and its decapitation are the mystery of the evil inclination that can return through repentance.