Apollos was an educated Jew who was said to have done what among the Jews?

ANSWER

vigorously refuted his Jewish opponents in public debate

Acts 18 :

(27) When Apollos wanted to go to Achaia, the brothers and sisters encouraged him and wrote to the disciples there to welcome him. When he arrived, he was a great help to those who by grace had believed. (28) For he vigorously refuted his Jewish opponents in public debate, proving from the Scriptures that Jesus was the Messiah.
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