Acts 16:23-26 HCSB
After they had inflicted many blows on them, they threw them in jail, ordering the jailer to keep them securely guarded. Receiving such an order, he put them into the inner prison and secured their feet in the stocks.
About midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them. Suddenly there was such a violent earthquake that the foundations of the jail were shaken, and immediately all the doors were opened, and everyone’s chains came loose.
HCSB: Holman Christian Standard Bible