1 Corinthians 1:17; 1 Corinthians 9:15

1 Corinthians 1:17

17 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.

1 Corinthians 9:15

15 But I have used none of these things. And I am not writing these things so that it will be done so in my case; for it would be better for me to die than have any man make my boast an empty one.