Acts 25:17-19

Therefore when they had come together, without any delay, the next day I sat on the judgment seat and commanded the man to be brought in.

18 When the accusers stood up, they brought no accusations against him of such things as I supposed.

19 but has some questions against him about their own religion and about a certain Jesus, who had died, whom Paul affirmed to be alive.

1. Festus soon learned that the charges were not legal matters. They were matters of Jewish custom and involved details of the Jewish religion.

2. He also learned about Jesus and the resurrection were at the core of this dispute.