What does the Bible say about God's covenant of salvation?

The covenant of salvation, as indicated in 2 Samuel 23:5, is an everlasting covenant that God established before the foundation of the world. This covenant is ordered in all things and sure because it is based solely on God's grace and the finished work of Christ. Unlike other covenants that were conditional upon human obedience, this covenant rests on Christ as the surety, meaning He completely met the requirements necessary for our salvation. Therefore, believers can be assured of their eternal security in this covenant, as it is entirely the work of God and not dependent on human actions.