How do we know that the fulfillment of the Old Covenant is true?

The truth of the fulfillment of the Old Covenant is grounded in the entirety of Christ's mission and His teachings. Jesus explicitly states that He did not come to abolish the Law or the Prophets but to fulfill them (Matthew 5:17). Each aspect of the Old Covenant, including the laws and the sacrificial system, finds its ultimate meaning and completion in His atoning work. Events like His crucifixion during Passover and the outpouring of the Holy Spirit at Pentecost highlight the culmination of Old Testament foreshadowing. The apostolic witness throughout the New Testament continually affirms that all promises of God find their 'yes' in Christ (2 Corinthians 1:20). Thus, the consistent testimony of Scripture supports that the Old Covenant has been fulfilled and is no longer binding.