Acts 18:22-26

When he had landed in Caesarea, he went up to Jerusalem and greeted the church, and went down to Antioch. Third Missionary Journey

And after spending some time there, he left and passed successively through the Galatian region and Phrygia, strengthening all the disciples.

Now a Jew named Apollos, an Alexandrian by birth, an eloquent man, came to Ephesus; and he was proficient in the Scriptures.

This man had been instructed in the way of the Lord; and being fervent in spirit, he was accurately speaking and teaching things about Jesus, being acquainted only with the baptism of John;

and he began speaking boldly in the synagogue. But when Priscilla and Aquila heard him, they took him aside and explained the way of God more accurately to him.