2 Corinthians 11:7-10, 12

Or did I commit a sin in humbling myself so that you might be exalted, because I preached God’s gospel to you free of charge? I robbed other churches by accepting support from them in order to serve you. And when I was with you and was in need, I did not burden anyone, for the brothers who came from Macedonia supplied my need. So I refrained and will refrain from burdening you in any way. As the truth of Christ is in me, this boasting of mine will not be silenced in the regions of Achaia.

And what I am doing I will continue to do, in order to undermine the claim of those who would like to claim that in their boasted mission they work on the same terms as we do.