1 Corinthians 9:1-2

And don’t tell me that I have no authority to write like this. I’m perfectly free to do this—isn’t that obvious? Haven’t I been given a job to do? Wasn’t I commissioned to this work in a face-to-face meeting with Jesus, our Master? Aren’t you yourselves proof of the good work that I’ve done for the Master? Even if no one else admits the authority of my commission, you can’t deny it. Why, my work with you is living proof of my authority!