'Preaching' in the Bible

Though some are preaching Christ out of envy and competition, others do it out of a good heart:

But those are preaching Christ in a spirit of competition, not from their hearts, but with the purpose of giving me pain in my prison.

What then? only that in every way, falsely or truly, the preaching of Christ goes on; and in this I am glad, and will be glad.

The things which came to you by my teaching and preaching, and which you saw in me, these things do, and the God of peace will be with you.