Acts 16:25-26

25 About midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them.
26 Suddenly there was an earthquake, so violent that the foundations of the prison were shaken; and immediately all the doors were opened and everyone's chains were unfastened.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.