11 God worked special miracles by the hands of Paul, 12 so that even handkerchiefs or aprons were carried away from his body to the sick, and the evil spirits went out.
13 But some of the itinerant Jews, exorcists, took on themselves to invoke over those who had the evil spirits the name of the Lord Jesus, saying, “We adjure you by Jesus whom Paul preaches.” 14 There were seven sons of one Sceva, a Jewish chief priest, who did this. 15 The evil spirit answered, “Jesus I know, and Paul I know, but who are you?” 16 The man in whom the evil spirit was leaped on them, and overpowered them, and prevailed against them, so that they fled out of that house naked and wounded. 17 This became known to all, both Jews and Greeks, who lived at Ephesus. Fear fell on them all, and the name of the Lord Jesus was magnified. 18 Many also of those who had believed came, confessing, and declaring their deeds. 19 Many of those who practiced magical arts brought their books together and burned them in the sight of all. They counted the price of them, and found it to be fifty thousand pieces of silver. [1] 20 So the word of the Lord was growing and becoming mighty.
Matthew Henry's Commentary on Acts 19:11-20
Commentary on Acts 19:8-12
(Read Acts 19:8-12)
When arguments and persuasions only harden men in unbelief and blasphemy, we must separate ourselves and others from such unholy company. God was pleased to confirm the teaching of these holy men of old, that if their hearers believed them not, they might believe the works.
Commentary on Acts 19:13-20
(Read Acts 19:13-20)
It was common, especially among the Jews, for persons to profess or to try to cast out evil spirits. If we resist the devil by faith in Christ, he will flee from us; but if we think to resist him by the using of Christ's name, or his works, as a spell or charm, Satan will prevail against us. Where there is true sorrow for sin, there will be free confession of sin to God in every prayer and to man whom we have offended, when the case requires it. Surely if the word of God prevailed among us, many lewd, infidel, and wicked books would be burned by their possessors. Will not these Ephesian converts rise up in judgement against professors, who traffic in such works for the sake of gain, or allow themselves to possess them? If we desire to be in earnest in the great work of salvation, every pursuit and enjoyment must be given up which hinders the effect of the gospel upon the mind, or loosens its hold upon the heart.