Acts 16:23-26

When they had struck them with many blows, they threw them into prison, commanding the jailer to guard them securely; and he, having received such a command, threw them into the inner prison and fastened their feet in the stocks. But about midnight Paul and Silas were praying and singing hymns of praise to God, and the prisoners were listening to them; and suddenly there came a great earthquake, so that the foundations of the prison house were shaken; and immediately all the doors were opened and everyone’s chains were unfastened.