John Chrysostom

"And there were seven sons of one Sceva, a Jew, and chief of the priests, which did so. And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye? And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded." They did it in secret: then their impotence is publicly exposed. Then not the Name does anything, unless it be spoken with faith. See how they used their weapons against themselves! …

Homily on Acts 41 ↗

Theophylact of Ohrid

Although the sons of Sceva did this secretly, their powerlessness is exposed. What is worthy of wonder is the circumstance that the evil spirit did not aid in the deception of these exorcists, but rather exposed and revealed their fraud. It seems to me that he was greatly irritated, just as someone who, being pressed in extreme danger by some wretched and insignificant creature, wants to pour out all his wrath upon that creature.

Commentary on Acts ↗

Bede

However, there were some seven sons of a Jewish high priest named Sceva, who were doing this. It is better read according to the Greek: However, there was of a certain Sceva. Since even Satan himself transforms into an angel of light (II Cor. XI), he does not fear to color his ministers with the same pretense. …

Commentary on Acts ↗