How do we know the doctrine of the Covenant is true?

The doctrine of the Covenant is substantiated by numerous passages in the Bible that highlight God's promise of redemption. The consummation of the New Covenant is evidenced in Christ’s blood, as indicated in Hebrews 9, and corresponds with the prophetic declarations and typologies seen throughout scripture. Jesus explicitly ties His sacrificial death to this New Covenant during the Last Supper, underscoring that this is the fulfillment of God’s redemptive plan. As His promises in Him are affirmed as 'yes' and 'amen', we can be confident in the veracity of these doctrines. Furthermore, the Old Testament sacrifices foreshadowed Christ’s finally effective atonement verifies the transformation from the Old Covenant to the New.