How do we know that Jesus was the true high priest?

Jesus is recognized as the true high priest in Christian theology because He fulfills and surpasses the role and function of the Levitical priests, represented by Anas and Caiaphas. While the Levitical priests offered sacrifices for their own sins and the sins of the people, Jesus, being sinless, offered Himself as the perfect sacrifice, accomplishing what the Old Testament sacrificial system could not achieve. His priesthood is established by God's decree and is eternal, as He mediates between God and humanity, thus initiating a new covenant with better promises. His obedience and ultimate sacrifice on the cross highlight both His authority and His identity as the high priest who advocates for believers.