Adam Clarke on Acts 25:7

The Jews - laid many and grievous complaints against Paul - As they must have perceived that the Roman governors would not intermeddle with questions of their law, etc., they no doubt invented some new charges, such as sedition, treason, etc., in order to render the mind of the governor evil affected towards Paul; but their malicious designs were defeated, for assertion would not go for proof before a Roman tribunal: this court required proof, and the blood-thirsty persecutors of the apostle could produce none.