'Preacher' in the Bible

For Christ sent me, not to give baptism, but to be a preacher of the good news: not with wise words, for fear that the cross of Christ might be made of no value.

For if I am a preacher of the good news, I have no cause for pride in this; because I am forced to do so, for a curse is on me if I do not.

What then is my reward? [Just this:] that, when I preach the gospel, I may offer the gospel without charge [to everyone], so as not to take advantage of my rights [as a preacher and apostle] in [preaching] the gospel.

If then it is I who am the preacher, or they, this is our word, and to this you have given your faith.