Acts of the Apostles 18:24, 26-27

Meanwhile, a Jew named Apollos, an eloquent speaker who knew the Scriptures well, had arrived in Ephesus from Alexandria in Egypt.

When Priscilla and Aquila heard him preaching boldly in the synagogue, they took him aside and explained the way of God even more accurately. Apollos had been thinking about going to Achaia, and the brothers and sisters in Ephesus encouraged him to go. They wrote to the believers in Achaia, asking them to welcome him. When he arrived there, he proved to be of great benefit to those who, by God’s grace, had believed.