John Gill Commentary Acts 24:21

"except it be for this one voice, that I cried standing among them, Touching the resurrection of the dead I am called in question before you this day." — Acts 24:21 (ASV)

Except it be for this one voice
Sentence or expression following, which declares his faith about the resurrection; not that he thought or owned that this was an evil in him, but that it was the only one, that any of them, the Jews, a part among them, namely, the Sadducees, could condemn, or judge to be evil in him:

that I cried, standing among them ;
whereby they were thrown into confusion and division among themselves: and it was this,

touching the resurrection of the dead I am called in question by you
this day ;
see (Acts 23:6) .