John Gill Commentary Acts 25:18

"Concerning whom, when the accusers stood up, they brought no charge of such evil things as I supposed;" — Acts 25:18 (ASV)

Against whom when the accusers stood up
As they were obliged to do, while they were exhibiting their charges, bearing their testimonies, and producing their proofs; (Acts 25:7) .

They brought none accusation of such things as I supposed :
for by his being left in bonds, and by the information of the chief priests and elders, and their violence against him, he imagined must be chargeable with some notorious capital crime.