1 Corinthians 16:12

But as touching Apollos the brother, I besought him much to come unto you with the brethren [with Titus, etc.]: and it was not at all his will to come now; but he will come when he shall have opportunity [Apollos first comes to our notice at Ephesus (Acts 18:24-28) whence he went to Corinth just before Paul came to Ephesus (Acts 19:1). From Corinth Apollos returned to and was now at Ephesus. The old Latin commentators say that he left Corinth on account of the violence of the factions, and now declined to return because of them, but it is not likely that they knew anything more about the facts than we do. Jerome tells us that after the factious spirit subsided, Apollos returned to Corinth, and became bishop or elder of the church; but he gives us no authority for his statement. Paul's words are important, because they show that neither he nor Apollos gave any countenance or encouragement to the factions. Paul has no fear that Apollos will do wrong intentionally, yet Apollos fears that he may do wrong by his presence unintentionally. It did not seem to Apollos that it was a fit season for him to show himself in Corinth.]