Acts 16:23 (KJV)

And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour.

And when her masters saw that the hope of their gains was gone, they caught Paul and Silas, and drew them into the marketplace unto the rulers,

And brought them to the magistrates, saying, These men, being Jews, do exceedingly trouble our city,

And teach customs, which are not lawful for us to receive, neither to observe, being Romans.

And the multitude rose up together against them: and the magistrates rent off their clothes, and commanded to beat them.

Who, having received such a charge, thrust them into the inner prison, and made their feet fast in the stocks.

And at midnight Paul and Silas prayed, and sang praises unto God: and the prisoners heard them.

And suddenly there was a great earthquake, so that the foundations of the prison were shaken: and immediately all the doors were opened, and every one's bands were loosed.

And the keeper of the prison awaking out of his sleep, and seeing the prison doors open, he drew out his sword, and would have killed himself, supposing that the prisoners had been fled.

But Paul cried with a loud voice, saying, Do thyself no harm: for we are all here.