'Gospel' in the Bible

I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:

Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.

But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.

As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.

But I certify you, brethren, that the gospel which was preached of me is not after man.

And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.

To whom we gave place by subjection, no, not for an hour; that the truth of the gospel might continue with you.

But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter;

But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?

And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.

Ye know how through infirmity of the flesh I preached the gospel unto you at the first.