The pronoun they refers, of course, to the mob or crowd—for example, “when the crowd recognized that he was a Jew.” This recognition might be based upon appearance, put it could have also been derived from his accent or the manner in which he spoke in defense of himself and his fellow Jews.

This verse would indicate that the Jews were not too well received in Ephesus. “There came one voice from them all” means, as the Good News Translation has translated, they all shouted together the same thing.

Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on The Acts of the Apostles. (UBS Handbook Series). New York: UBS, 1972. For this and other handbooks for translators see here .