John Gill Commentary Acts 25:25

"But I found that he had committed nothing worthy of death: and as he himself appealed to the emperor I determined to send him." — Acts 25:25 (ASV)

But when I found that he had committed nothing worthy of
death
Which was a public testimony of the apostle's innocence, to the great mortification of his enemies, some of whom might be present; a like testimony was given of him by Lysias, (Acts 23:29) .

And that he himself has appealed unto Augustus ;
the Emperor Nero; see (Acts 25:21) .

I have determined to send him ;
having had the opinion of his council upon it.