1 Corinthians 1:17; 1 Corinthians 9:16; 1 Corinthians 9:18; 1 Corinthians 15:1-2
For Christ did not send me to baptize, but to preach the gospel, not in cleverness of speech, so that the cross of Christ would not be made void.
For if I preach the gospel, I have nothing to boast of, for I am under compulsion; for woe is me if I do not preach the gospel.
What then is my reward? That, when I preach the gospel, I may offer the gospel without charge, so as not to make full use of my right in the gospel.
Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand,
by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain.