What does the Bible say about the gospel being an eternal message?

The gospel is described as both ancient and new, signifying its timeless essence and its continuous relevance in the lives of believers. It is set forth in Scriptures as the 'everlasting gospel,' emphasizing that it is as old as God himself. As testified in Acts 28:8-10, when the apostle Paul speaks of the gospel, he conveys that its core message remains unchanged and that it manifests itself in various forms throughout the Scriptures. This attests to God's unwavering character and the divine inspiration of the Scriptures, which reveal who God is and provide the gospel's message of salvation through His Son.