Acts 18:18-28 NASB
Paul, having remained many days longer, took leave of the brethren and put out to sea for Syria, and with him were Priscilla and Aquila. In Cenchrea he had his hair cut, for he was keeping a vow. They came to Ephesus, and he left them there. Now he himself entered the synagogue and reasoned with the Jews. When they asked him to stay for a longer time, he did not consent, but taking leave of them and saying, “I will return to you again if God wills,” he set sail from Ephesus.
When he had landed at Caesarea, he went up and greeted the church, and went down to Antioch.
And having spent 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 mighty in the Scriptures. This man had been instructed in the way of the Lord; and being fervent in spirit, he was speaking and teaching accurately the things concerning Jesus, being acquainted only with the baptism of John; and he began to speak out boldly in the synagogue. But when Priscilla and Aquila heard him, they took him aside and explained to him the way of God more accurately. And when he wanted to go across to Achaia, the brethren encouraged him and wrote to the disciples to welcome him; and when he had arrived, he greatly helped those who had believed through grace, for he powerfully refuted the Jews in public, demonstrating by the Scriptures that Jesus was the Christ.
NASB: New American Standard Bible