1 Corinthians 9:2
9:2 If I am not an apostle to others, at least I am to you, for you are the confirming sign 1 of my apostleship in the Lord.
1 Corinthians 15:9
15:9 For I am the least of the apostles, unworthy to be called an apostle, because I persecuted the church of God.
1 tn Grk “the seal.”