How do we know the doctrine of redemption through Christ's blood is true?

The doctrine of redemption through Christ's blood is grounded in Scripture, which articulates a consistent narrative about the significance of Jesus' blood. For instance, Ephesians 1:7 states that we have redemption through His blood, signifying the forgiveness of sins according to the riches of His grace. The consistency of God’s testimony across the New Testament assures us of its truth. Additionally, Hebrews 9:12 states that Christ entered into the holy place with His own blood, obtaining eternal redemption for us, which underscores the efficacy and permanence of the redemption that His blood accomplished.