Acts 19:11 (KJV)

And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.

And all the men were about twelve.

And he went into the synagogue, and spake boldly for the space of three months, disputing and persuading the things concerning the kingdom of God.

But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.

And this continued by the space of two years; so that all they which dwelt in Asia heard the word of the Lord Jesus, both Jews and Greeks.

So that from his body were brought unto the sick handkerchiefs or aprons, and the diseases departed from them, and the evil spirits went out of them.

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.

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.