Bede : However, certain itinerant Jewish exorcists attempted to invoke over those who, etc. Josephus reports that King Solomon devised and taught his people modes of exorcism, that is, adjurations, by which unclean spirits, once expelled from a person, might not dare to return. This sometimes happens even through reprobates, either for the condemnation of those who do such things or for the benefit of those who see and hear, so that although men may despise those who perform the signs, they nevertheless honor God, at whose invocation such great miracles are performed. — Commentary on Acts John Chrysostom : "Then certain of the vagabond Jews, exorcists, took upon them to call over them which had evil spirits the name of the Lord Jesus, saying, We adjure you by Jesus whom Paul preacheth." So entirely did they do all by way of trade! Observe: vagabond, or, itinerant, Jewish exorcists. And to believe indeed, they had no mind; but by that Name they wished to cast out the demons. "By Jesus, whom Paul preacheth." Only see what a name Paul had got! Wonderful, how great the power of them that have believed! Both Simon for the sake of merchandise sought the grace of the Spirit, and these for this object did this. What hardness of heart! Why does not Paul rebuke them? It would have looked like envy, therefore it is so ordered. — Homily on Acts 41 Lucius Caecilius Firmianus Lactantius : And the nature of all these deceits is obscure to those who are without the truth. For they think that those demons profit them when they cease to injure, whereas they have no power except to injure. Some one may perchance say that they are therefore to be worshipped, that they may not injure, since they have the power to injure. They do indeed injure, but those only by whom they are feared, whom the powerful and lofty hand of God does not protect, who are uninitiated in the mystery of truth. But they fear the righteous, that is, the worshippers of God, adjured by whose name they depart from the bodies of the possessed: for, being lashed by their words as though by scourges, they not only confess themselves to be demons, but even utter their own names—those which are adored in the temples—which they generally do in the presence of their own worshippers; not, it is plain, to the disgrace of religion, but to the disgrace of their own honour, because they cannot speak falsely to God, by whom they are adjured, nor to the righteous, by whose voice they are tortured. Therefore ofttimes having uttered the greatest howlings, they cry out that they are beaten, and are on fire, and that they are just on the point of coming forth: so much power has the knowledge of God, and righteousness! — The Divine Institutes, Book 2, Chapter XVI Oecumenius : "Some of the roaming Jewish exorcists." This statement shows that they did not, like exorcists believing in Jesus, adjure unclean spirits in the name of the Lord, but were testing them: wherefore also, since they were not faithful, as the evil spirit says, they shortly paid the penalty of their foolishness. For the spirit exposed them, and wholly exposed their deceit, moved by anger: as when one placed in extreme dangers is attacked by some enemy, and all wrath is poured out upon him. — Commentary on Acts