What is the gospel that must be proclaimed for salvation?

The gospel, as preached by Paul, is the good news of Jesus' death, burial, and resurrection. In 1 Corinthians 15:3-4, Paul summarizes the gospel stating that Christ died for our sins, was buried, and rose on the third day according to the Scriptures. This foundational message emphasizes that Christ's sacrificial death and victorious resurrection bring salvation to those who believe, fulfilling God's redemptive plan (Romans 1:16). It is the singular message that should guide all preaching for it stands as the power of God for salvation.