The reading is from St. Paul's First Letter to the Corinthians 9:13-18

Brethren, do you not know that those who are employed in the temple service get their food from the temple, and those who serve at the altar share in the sacrificial offerings? In the same way, the Lord commanded that those who proclaim the gospel should get their living by the gospel. But I have made no use of any of these rights, nor am I writing this to secure any provision. For I would rather die than have any one deprive me of my ground for boasting. For necessity is laid upon me. Woe to me if I do not preach the gospel! For if I do this of my own will, I have a reward; but if not of my own will, I am entrusted with a commission. What then is my reward? Just this: that in my preaching I may make the gospel free of charge, not making full use of my right in the gospel.