What does the Bible say about Christ being our covenant?

Isaiah 49:8 tells us, 'I will give thee for a covenant of the people.' This declaration signifies that Christ Jesus Himself is the covenant established by God for His chosen people. In Him, all the promises of God are certain; they are 'yes and amen' to the glory of God. Through Christ, God fulfills His promises, securing salvation and eternal life for the elect. This covenant ensures that believers can rest assured in their salvation as it is rooted in the fidelity of Christ, who is the mediator of this covenant relationship between God and His people.