1 Corinthians 15:9-11

All the other apostles are greater than I am. I am not even good enough to be called an apostle, because I persecuted the church of God. But God’s grace has made me what I am, and his grace to me was not wasted. I worked harder than all the other apostles. (But it was not I really; it was God’s grace that was with me.) So if I preached to you or the other apostles preached to you, we all preach the same thing, and this is what you believed.