'Preaching' in the Bible

For God, whom I serve with my spirit by preaching the gospel of His Son, is my witness as to how continuously I mention you

So faith comes from hearing [what is told], and what is heard comes by the [preaching of the] message concerning Christ.

with the power of signs and wonders, [and all of it] in the power of the Spirit. So [starting] from Jerusalem and as far away as Illyricum, I have fully preached the gospel [faithfully preaching the good news] of Christ [where it had not before been preached].

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