Albert Barnes on Acts 14:4

Was divided. Into parties. Greek, There was a schism. εσχισθη.

And part held with the Jews. Held to the doctrines of the Jews, in opposition to the apostles. A revival of religion may produce excitement by the bad passions of opposers. The enemies of the truth may form parties, and organize opposition. It is no uncommon thing even now for such parties to be formed; but the fault is not in Christianity. It lies with those who form a party against religion, and who confederate themselves, as was done here, to oppose it.

(e) "part held with the Jews" Acts 28:24