How do we know that Christ is the mediator of the New Covenant?

The Bible presents Jesus Christ as the mediator of the New Covenant through His unique role as the perfect sacrifice. In Hebrews 9:14-15, it is declared that Christ, through His death, obtained eternal redemption for His people. This means that He satisfied God's justice, which was a requirement for the establishment of the New Covenant. By entering the holy place with His own blood, He became the mediator of this covenant, a role reaffirmed in various parts of Scripture, including Hebrews and Ephesians. Importantly, this mediation is not a mere title; it implies that Christ actively intercedes for His people, ensuring that they receive the promised blessings of the covenant, further underscoring His centrality in the salvation story.