What is the everlasting covenant in the Bible?

The everlasting covenant is a theological concept rooted in the Scriptures, particularly highlighted in Hebrews 13:20. It encompasses God’s eternal plan for redemption, established before the foundation of the world, as revealed in passages like Jeremiah 31:33. In this covenant, the Father, Son, and Holy Spirit agreed to save a multitude from sin and its consequences, assuring believers of their eternal inheritance. This covenant stands in contrast to the temporary Mosaic covenant, emphasizing the completeness and sufficiency of Christ's sacrificial work that enables believers to be reconciled to God.