1 Corinthians 15:1-
Romans 3:24 Being justified freely by his grace through the redemption that is in Christ Jesus:
* God’s righteousness is revealed in the Gospel of Christ; the righteous believe it by faith.
** the death, burial, and resurrection of Christ is the basis of the Gospel message.
*** the gospel message is about being made just by the grace of Christ apart from our own works.
Websters 1828 dictionary defines the gospel as follows:
GOS'PEL, n. L. evangelium, a good or joyful message.
The history of the birth, life, actions, death, resurrection, ascension and doctrines of Jesus Christ; or a revelation of the grace of God to fallen man through a mediator, including the character, actions, and doctrines of Christ, with the whole scheme of salvation, as revealed by Christ and his apostles. This gospel is said to have been preached to Abraham, by the promise, "in thee shall all nations be blessed." Ga.3.8.
It is called the gospel of God. Rom.1.1.
It is called the gospel of Christ. Rom.1.16.
It is called the gospel of salvation. Eph. 1.13.