1 Corinthians 15:9-10 NIV

9 For I am the least of the apostles and do not even deserve to be called an apostle, because I persecuted the church of God.

References for 1 Corinthians 15:9

10 But by the grace of God I am what I am, and his grace to me was not without effect. No, I worked harder than all of them—yet not I, but the grace of God that was with me.

References for 1 Corinthians 15:10