27 And if such be the case, if through evil angels God did inflict those plagues upon the Egyptians, shall we dare to say that the water also was turned into blood by means of those same angels, and that frogs were created by means of the same, the like whereunto even the magicians of Pharaoh were able to make by their enchantments; so as that evil angels stood on both sides, on the one side afflicting them, on the other side deceiving them, according to the judgment and dispensation of the most just and most omnipotent God, who does justly make use of even the naughtiness of unrighteous men?
I dare not to say so. For whence was it that the magicians of Pharaoh could by no means make lice? Was it not because even these same evil angels were not suffered to do this? Or, to speak more truly, is not the cause hidden, and it does exceed our powers of inquiry? For if we shall have supposed that God wrought those things by means of evil angels, because punishments were being inflicted, and not blessings being bestowed, as though God does inflict punishments upon no one by means of good angels, but by means of those executioners as it were of the heavenly wrath; the consequence will be that we must believe that even Sodom was overthrown by means of evil angels, and that Abraham and Lot would seem to have entertained under their roof evil angels; the which, as being contrary to the most evident Scriptures, far be it that we should think.
It is clear then that these things might have been done to men by means of good and evil angels. What should be done or when it should be done does escape me: but Him that does it, it escapes not, and him unto whom He shall have willed to reveal it. Nevertheless, as far as divine Scripture does yield to our application thereto, on evil men that punishments are inflicted both by means of good angels, as upon the Sodomites, and by means of evil angels, as upon the Egyptians, we read: but that just men with corporal penances by means of good angels are tried and proved, does not occur to me.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)