1 Corinthians 4:4

4:4 For I am not aware of anything against myself, but I am not acquitted because of this. The one who judges me is the Lord.

1 Corinthians 9:16

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!

1 Corinthians 16:10

16:10 Now if Timothy comes, see that he has nothing to fear among you, for he is doing the Lord’s work, as I am too.