1 Corinthians 15:11

15:11 Whether then it was I or they, this is the way we preach and this is the way you believed.

1 Corinthians 15:2

15:2 and by which you are being saved, if you hold firmly to the message I preached to you – unless you believed in vain.

1 Corinthians 3:5

3:5 What is Apollos, really? Or what is Paul? Servants through whom you came to believe, and each of us in the ministry the Lord gave us. ¹ 

[3:5]  ¹ tn Grk “and to each as the Lord gave.”