1 Corinthians 9:1-2New King James Version (NKJV)
A Pattern of Self-Denial
9 Am I not an apostle? Am I not free? Have I not seen Jesus Christ our Lord? Are you not my work in the Lord? 2 If I am not an apostle to others, yet doubtless I am to you. For you are the seal of my apostleship in the Lord.