1 Corinthians 15:9-11

9 For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God.

10 But by the grace of God I am what I am: and his grace which was bestowed on me was not in vain; but I labored more abundantly than they all: yet not I, but the grace of God which was with me.

11 Therefore whether it were I or they, so we preach, and so you believed.