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

The doctrine of the covenant is rooted in biblical evidence, beginning with the sacrificial system established in the Old Testament, where blood is central to atonement. From Adam to Moses, sacrifice was integral to God's plan for redemption, culminating in Christ as the ultimate sacrifice (Hebrews 9:22). His blood fulfilled the covenant, ratifying God's promises and demonstrating God's unchanging character. Additionally, the resurrection of Jesus confirms the effectiveness of this sacrifice, assuring believers of their salvation and the unbreakable nature of the covenant made between the Father and the Son.