But at midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them. 26 Suddenly there was a great earthquake, so that the foundations of the prison were shaken; and immediately all the doors were opened and everyone’s chains were loosed. 27 And the keeper of the prison, awaking from sleep and seeing the prison doors open, supposing the prisoners had fled, drew his sword and was about to kill himself. 28 But Paul called with a loud voice, saying, “Do yourself no harm, for we are all here.”
29 Then he called for a light, ran in, and fell down trembling before Paul and Silas. 30 And he brought them out and said, “Sirs, what must I do to be saved?”
31 So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.” 32 Then they spoke the word of the Lord to him and to all who were in his house. 33 And he took them the same hour of the night and washed their stripes. And immediately he and all his family were baptized. 34 Now when he had brought them into his house, he set food before them; and he rejoiced, having believed in God with all his household. — Acts 16:25-34.
In an amazing sequence with their fellow prisoners listening, Paul and Silas pray and sing hymns to God at midnight after which a great earthquake shakes the foundations of the prison, opening all the doors and loosening all the chains. The jailer is about to commit suicide assuming the prisoners have fled. Paul and Silas intervene and preach the gospel to him. He and all his family believe and are baptized. They take care of Paul and Silas. No prisoners are lost physically, but he and his family are saved spiritually!