1 Corinthians 3:6 - Ellicott's Commentary On The Whole Bible

I have planted, Apollos watered. — By an image borrowed from the processes of agriculture the Apostle explains the relation in which his teaching stood to that of Apollos — and how all the results were from God. This indication of St. Paul having been the founder, and Apollos the subsequent instructor, of the Corinthian Church, is in complete harmony with what we read of the early history of that Church in Acts 18:27; Acts 19:1. After St. Paul had been at Corinth (Acts 18:1), Apollos, who had been taught by Aquila and Priscilla at Ephesus, came there and “helped them much which had already believed.”