In general, Christians believe that the Promised New Covenant was introduced at the Last Supper as part of the Eucharist , which contains the New Commandment in the Gospel of John. Based on the doctrine of the Bible: “For where there is a will, there must necessarily be the death of the deceased. For a will is of power, after the death of men; Otherwise, it is not at all powerful, while the deceased is alive,” Protestants tend to believe that the New Covenant only came into force with the death of Jesus Christ.   The commentary of the Roman Catholic Bible of New America also confirms that Christ is the “deceased whose death puts his will into practice.”  Christians therefore believe that Jesus is the mediator of the New Covenant and that the blood of Christ shed at his crucifixion is the necessary blood of the covenant. The Old Testament, or the ancient covenant, deduces its name from God`s agreement with the nation of Israel on Mount Sinai. The Bible explains it as follows: God made an alliance with a man named Abram (his name was later changed to Abraham). In this agreement, he promised to bless the descendants of Abraham. The Bible documents what happened: the occurrence of the phrase “new covenant” varies in English translations of the Greek New Testament. The King James version sometimes used testament for the covenant, with the new covenant words together only in Hebrews 8:8, 8:13 and 12:24 while in the new international version of the “new covenant” to Luke 22:20, 1 Corinthians 11:25, 2 Corinthians 3:6, Hebrews 8:8, Hebrews 9:15 and Hebrews 12:24 in translation of a form of “11” and “12” or “Hebrews” (12) or “Hebrews 12:24” ())  One of the central themes of the Old Testament is the idea of an alliance or an agreement between God and humanity. The Bible lists a series of covenants that God has introduced. These include: Indeed, there are promises that appear in this passage, which go beyond what Solomon has accomplished. God`s agreement with David found its final fulfillment in Jesus. The Bible recounts the visit of the angel Gabriel to the Virgin Mary, who explained how this covenant in Jesus is accomplished.
The Bible says: In the Bible, the covenant is generally considered an agreement between a superior and an inferior; it is not an agreement between equals. The senior member grants certain rights and privileges to the losing member. This is illustrated by the various covenants that God has made with his people. Thanks to the prophet Jeremiah, God also promised a new covenant.