Gospel literally means “good news” and that is exactly what it is.
It is the good news concerning the person and work of Jesus Christ on behalf of sinners.
Speaking of the gospel in 1 Corinthians 15, Paul explains it is a matter of first importance “…that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures, and that he appeared to Cephas, then to the twelve.”
The following paragraph summarizes the message of the gospel within the context of Scripture.
The Bible tells us that God is a loving Creator, a sovereign King, and a righteous Judge. But because we don’t worship God as Creator or obey God as King, we stand condemned under God’s judgment. In fact the penalty for our sin is death and hell – and there is nothing we can do to change this. But there is good news, because God became a man in the person of His Son – Jesus. And when He came to this earth, Jesus lived a perfect life and died on a cross in the place of sinners, taking the judgment we deserved. Three days later, Jesus rose bodily from the grave and now reigns with God in heaven. As resurrected Savior and Lord, Jesus offers forgiveness, righteousness, the presence of His Spirit, and eternal life to all who follow him. And Scripture is clear that those who follow Jesus must turn from their sin and trust in Him alone for their salvation.
Want more proof? What does the Bible say? Gospel Scripture References.