God has an agreement with me. God is good for His word. This agreement is sealed with the blood of my Master Jesus. It doesn’t get any better than that.
My lovingkindness I will keep for him [Jesus] forever, and My covenant shall be confirmed to him. | Psalm 89:28
A covenant is an agreement between two parties. In the scriptures, it is between God and His people or certain specific individuals. The fulfilment of God’s purposes of salvation expressed in the covenants of the scriptures, mediated by Jesus the Messiah and sealed in his blood. It is a covenant of grace, the benefits of which include forgiveness, a renewed relationship with God and, through the Holy Spirit, an inward transformation that enables obedience to its demands and so ensures that it will not again be broken.
The New Covenant (or New Testament) is the promise that God makes with humanity that He will forgive sin and restore fellowship with those whose hearts are turned toward Him. Jesus the Messiah is the mediator of the New Covenant, and His death on the cross is the basis of the promise. The New Covenant was predicted while the Old Covenant was still in effect — the prophets Moses, Jeremiah, and Ezekiel all allude to the New Covenant.