Romans 1:1 (NIV)
Paul, a servant of Christ Jesus, called to be an apostle and set apart for the gospel of God—
Galatians 1:1 (NIV)
Paul, an apostle–sent not from men nor by man, but by Jesus Christ and God the Father, who raised him from the dead—
2 Timothy 1:11 (NIV)
11And of this gospel I was appointed a herald and an apostle and a teacher.
1 Timothy 1:12 (NIV)
12I thank Christ Jesus our Lord, who has given me strength, that he considered me faithful, appointing me to his service.