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

The doctrine of salvation through Christ's blood is substantiated by both Old Testament prophecies and New Testament fulfillments. In Isaiah 53, we see the prophetic imagery of a suffering servant who bears our iniquities, which is fulfilled in Jesus Christ as described in the Gospels. The New Testament further clarifies this doctrine, with passages like Ephesians 1:7 stating, 'In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace.' The historical and theological consistency across the scriptures confirms that salvation hinges on the significance of Christ's shed blood, establishing its truth and necessity.