Albert Barnes on Acts 28:21

We neither received letters, etc. Why the Jews in Judea had not forwarded the accusation against Paul to their brethren at Rome, that they might continue the prosecution before the emperor, is not known. It is probable that they regarded their cause as hopeless, and chose to abandon the prosecution. Paul had been acquitted successively by Lysias, Felix, Festus, Agrippa; and as they had not succeeded in procuring his condemnation before them, they saw no prospect of doing it at Rome, and chose therefore not to press the prosecution any farther.

Neither any of the brethren that came. Any of the Jews. There was a very constant intercourse between Judea and Rome; but it seems that the Jews, who had come before Paul had arrived, had not mentioned his case, so as to prejudice them against him.

(*) "shewed" "related"