Priscilla and Aquila instructed Apollos about the gospel.

Acts 18:24-26

24 While Paul was traveling in Galatia and Phrygia, a Jewish man whose name was Apollos came to Ephesus. He was a native of Alexandria city. He spoke eloquently and he knew the Scriptures thoroughly. 25 Other believers had taught him some things about how the Lord Jesus desires that people should conduct themselves, and he taught those things very enthusiastically to people. He had heard about some of the things that Jesus did and said, and he taught those facts accurately to people. However, he was teaching incompletely about Jesus, because he knew only what John the Baptizer had taught people whom he baptized. 26 Apollos went to the Jewish meeting place, and he told the people there very confidently the things that he had learned. When Priscilla and Aquila heard what Apollos taught, they invited him to their home. There they explained more accurately to him the way that God gives people eternal life.