Verses 25 and 26

But about midnight when Paul and Silas were praying and singing hymns of praise to God, and the prisoners were listening to them;

suddenly there was a great earthquake, so [powerful] that the very foundations of the prison were shaken and at once all the doors were opened and everyone’s chains were unfastened.

The praise and prayer of just two people brought about deliverance to others who didnt even participate in the exercise, but only listened.
This is interesting! You know why? Maybe there were prisoners who had been in prison for 5, 10, 15 or even 20 years. But, that night, as they listened to Paul and Silas sing and pray, they received their deliverance.

Sometimes, God takes us to some places just to set others free. Perhaps, those prisoners may not have received their deliverance if Paul and Barnabas were not imprisoned in the same prison.