Covenant is a contract or agreement that God reveals to and for his people. The framework of the Bible is covenant. To understand clearly the scope of the Bible, it is necessary to understand covenant.
The Bible reveals two major covenants (Galatians 4:21-31). The Old Covenant is also known as the Old Testament, and the New Covenant as the New Testament. The point is that God works through covenant with people. The covenants point us to Christ.
The Old Covenant came to the nation of Israel through Moses as the mediator. It was the covenant of law, commanding holy days, sacrifices, and priestly rituals, that pointed toward our great High Priest Jesus Christ. It was Christ alone who fulfilled the Old Covenant and made the one final and only complete sacrifice for sin.
The New Covenant came through our Lord Jesus Christ, who is forever the one and only Mediator between God and man (1 Timothy 2:5-6). Jesus is the Prophet, Priest, and King of the New Covenant, which is an everlasting covenant (Hebrews 13:20-21). All who trust in our Lord Jesus Christ are God's chosen people in Christ, through the promises of the everlasting covenant. Our New Covenant with God is in Christ.