Much error has been taught in the denominational world due to their failure to “rightly divide the word of truth” (2 Tim. 2:15). They see little need in distinguishing between the old and new Covenants. They are as likely to go to the Old Covenant for authority as to the new.
Churches of Christ have faithfully taught that we must rightly divide the old from the new and that we are to follow the new and not the Old Covenant. We have correctly taught that the New Covenant is our guide and authority. We learn from the Old Covenant (Rom. 15:4,) but it is not our guide and authority. We have taught this because the Bible clearly teaches it.
There are several reasons why this is so.
A New Covenant was needed because the old was faulty: “For if that first Covenant had been faultless, then no place would have been sought for a second” (Heb. 8:7). The old was faulty because it contained no real provision for the forgiveness of sin (righteous people who lived during the Old Testament were saved looking forward to the blood of Christ). Under the new, sins are remembered no more.
Christ came to take away the old to establish the new: “‘Behold, I have come to do Your will, O God.’ He takes away the first that He may establish the second. By that will we have been sanctified through the offering of the body of Jesus Christ once for all “ (Heb. 10:9-10). How much plainer could He have been? “He takes away the first that He may establish the second” is as clear as any statement found in the scriptures! Certainly no one can misunderstand!
Old was to be cast out: Paul uses an allegory to show the difference between the old and new. “Tell me, you who desire to be under the law, do you not hear the law? For it is written that Abraham had two sons: the one by a bondwoman, the other by a freewoman. But he who was of the bondwoman was born according to the flesh, and he of the freewoman through promise, which things are symbolic. For these are the two Covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar, for this Haggar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children, but the Jerusalem above is free, which is the mother of us all. For it is written:
You who do not bear!
Break forth and shout,
You who are not in labor!
For the desolate has many more children
Than she who has a husband.”
It makes Christ’s death vain: “I do not set aside the grace of God; for if righteousness comes through the law, then Christ died in vain” (Gal. 2:21). People had the Law (Old Covenant) before Christ came and died. If the Law could have saved them then Christ would not have had to come, be humiliated, rejected by men, tried unjustly and die upon the cross. To hold to the Old Covenant makes Christ’s death useless!