The New Covenant – Fullness in Christ.
Even a casual read of the Bible reveals several covenants. Many books have been written about them. One covenant, the New Covenant, stands as the answer to everything that is wrong, God’s final Word on making all things right. The glory of being in Christ Jesus is revealed in this covenant, which binds Christ and His church together, providing redemption and eternal salvation for sinners. The sign of the New Covenant is circumcision not made with human hands followed by water baptism (Colossians 2:11-12). The Lord's Supper is another sign within this covenant, reminding us of its Author and His return (1 Corinthians 11:25). One dear brother I count as a friend helps us see this:
Baptism serves as an outward sign of the inward grace of regeneration and union with Christ. It is less than meaningless if there is no inward grace to reflect. Jesus said, “This cup is the new covenant in my blood” (Luke 22:20). What Jesus is saying is that this cup of wine represents the new covenant he is going to ratify by shedding his blood. This cup becomes the sign of that covenant. Every time we take communion we should rejoice that we are heirs of the new and better covenant that was ratified by his blood.
In Hebrews 7-9 the New Covenant described, contrasted with the Old Covenant, so we can see it more accurately. Chapter 9:1 even the first covenant had regulations for worship and an earthly place of holiness. What follows is a description of the tabernacle of the Hebrew religion, featuring lampstands, a table and bread, the Most Holy Place with the ark of the Mosaic covenant containing the tablets of testimony, the golden vial of manna, and Aaron's staff. Levitical priests ever making sacrifices that would cover sin for a time but never able to take away sin. All of these forms of worship are summed up in verse 9 as symbolic for that age and “imposed until the time of reformation” (verse 10). There will be no re-institution of those types and symbols as the sacrifice of the Lord Jesus was sufficient, satisfying God the Father and finishing the redemptive work announced in Genesis 3:15, bringing that reformation.
when Christ appeared as a high priest of the good things that have come, then through the greater and more perfect tent (not made with hands, that is, not of this creation [speaking here of His body of flesh]) he entered once for all into the holy places, not by means of the blood of goats and calves but by means of his own blood, thus securing an eternal redemption. Therefore he is the mediator of a new covenant, so that those who are called may receive the promised eternal inheritance, since a death has occurred that redeems them from the transgressions committed under the first covenant. (Hebrews 9:11-12 & 15)