How do we know Christ's sacrificial death is true?

The truth of Christ's sacrificial death is established through both Old Testament prophecy and the New Testament's fulfillment of these prophecies. For instance, Jesus' role as the Passover Lamb was foretold, aligning with scriptures that depict the Messiah as a suffering servant (Isaiah 53). He addressed His impending death during the Last Supper when He described the bread and the cup as His body and blood, given for us. Additionally, passages such as Hebrews 10:10 affirm that we are sanctified through the offering of the body of Jesus Christ once for all, demonstrating that His sacrifice is both sufficient and complete. His death and resurrection provide the necessary means for our salvation, ensuring that all for whom He died will ultimately be saved.