1 Corinthians 9:15-16
9:15 But I have not used any of these rights. And I am not writing these things so that something will be done for me. In fact, it would be better for me to die than – no one will deprive me of my reason for boasting!
9:16 For if I preach the gospel, I have no reason for boasting, because I am compelled to do this. Woe to me if I do not preach the gospel!