Both covenants have always been in place, and typified by the Two Trees in Eden.
Through the old testament, we can see there are those that serve according to the old, that is, the ones that are trusting in keeping the law like the Pharisees, and the ones who trust in the righteousness of God like Job and others who were called holy.
It continues today and the majority of believers imagine that they earn benefits through their own observance of the commandments and trust that they will have tried enough to gain favour. But they are mistaken and are working to improve the flesh which was condemned on the cross.
Only those who believe on that and that Christ took away their sins are in the new covenant.
The old and the new covenant are two different covenants pertaining to two different ages. They never overlap! When the new was introduced, the old became obsolete. The new covenant was made for the sacrifice of Christ's life.
So, what is the difference between the Old Testament period and the New Testament period? Is the old covenant still alive and relevant or has it been superseded?
The main difference between the Old Testament period and the New Testament period is their perspective of Jesus Christ! The Old Testament was looking forward to the coming Messiah. The New Testament reveals His arrival and precious work on man’s behalf. As we dig deeper and compare both, we notice that there are notable differences between the two arrangements. We see a significant move:
· From the shadow and type to the substance and reality
· From the imperfect to the perfect
· From the inadequate to the all-sufficient.
· From the physical to the spiritual
· From the external to the internal
· From the natural to the supernatural
· From the temporary to the eternal
· From the earthly to the heavenly
· From the national to the international
· From the conditional to the unconditional
These two economies couldn’t be more diverse. The improvement is obvious, substantial and indisputable. The repercussions are even greater for mankind. What was long-anticipated by the old covenant prophets has now wonderfully arrived. The appearance of Israel’s Messiah was the pivotal moment in history and the catalyst for a colossal transformative change.
The book of Hebrews shows the abolition of the old covenant arrangement and its replacement by the new superior covenant. It is absorbed with the superiority of Christ. Hebrews 8:6 declares: “now hath he [Christ] obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.”
The old covenant is gone forever. It has been replaced by a new and better covenant. There is absolutely no distinction between Jew and Gentile today in Christ. The old is obsolete. What is more, there is not one single teaching from Christ, Paul, Peter or any of the New Testament writers that remotely suggests the Old Testament land promises, ordinances or traditions lasted any longer than the cross. The focus is Christ’s redemptive work, and the scope is extended to the world.
Saying all this: the basis of salvation is the same in both the Old and the New Testaments. The old covenant saints looked forward by faith to Israel’s coming Redeemer and experienced forgiveness. Only those Israelis who accept the Gospel constituted God’s people. Dispensationalists should know: salvation has always been by grace, through faith, in Christ (the Messiah). Men of faith are found throughout the Old Testament. Hebrews 11 attests to this in a very powerful and detailed way. If men are born in sin, and if faith is the product of the regenerating power of the Holy Spirit, then the Old Testament saints must assuredly have supernaturally been birthed of the Spirit. Faith is the spiritual fruit of the renewing work of the Spirit of God within a human. Of course, the old covenant saints looked forward “by faith” to their promised coming Messiah who would redeem His people (Hebrews 11:13). But it seems evident that the Spirit performs the same transformative function in Old Testament times as He does in the New Testament economy.