'Preaching' in the Bible

As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!

but only, they kept hearing, “He who once persecuted us is now preaching the faith which he once tried to destroy.”

And I went up by revelation; and I put before them the good news which I was preaching among the Gentiles, but privately before those who were of good name, so that the work which I was or had been doing might not be without effect.

But, quite the opposite, when they saw that I had been made responsible for preaching the good news to those without circumcision, even as Peter had been for those of the circumcision

But you have knowledge that with a feeble body I was preaching the good news to you the first time;

As for me, brothers, if I am still preaching the necessity of circumcision, why am I still being persecuted? In that case the offense of the cross has been removed.