'Preaching' in the Bible

For God, whom I serve in my spirit in the preaching of the gospel of His Son, is my witness as to how unceasingly I make mention of you,

But what does it say? “The word is near you, in your mouth and in your heart”—that is, the word of faith which we are preaching,

Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which has been kept secret for long ages past,