What does it mean to be under the New Testament? Are we in a New or Old Testament? The New Testament came in effect at Jesus' death:
" Heb 9: 15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions [that were] under the first testament, they which are called might receive the promise of eternal inheritance. 16 For where a testament [is], there must also of necessity be the death of the testator.5 17 For a testament [is] of force after men are dead: otherwise it is of no strength at all while the testator liveth. 18 Whereupon neither the first [testament] was dedicated without blood.6 19 For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people,7 20 Saying, This [is] the blood of the testament which God hath enjoined unto you. 21 Moreover he sprinkled with blood both the tabernacle, and all the vessels of the ministry. 22 And almost all things are by the law purged with blood; and without shedding of blood is no remission.
23 [It was] therefore necessary that the patterns of things in the heavens should be purified with these; but the heavenly things themselves with better sacrifices than these. 24 For Christ is not entered into the holy places made with hands, [which are] the figures of the true; but into heaven itself, now to appear in the presence of God for us: 25 Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; 26 For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself. 27 And as it is appointed unto men once to die, but after this the judgment: 28 So Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation."
Most people are confused when referring to Jesus doing this or that while in the "New Testament", not realizing that even though they are reading in the New Testament that it itself does not come in effect till His death on the cross. All the events in the N. T. Gospels are still under the O.T. until we come to the cross, there things changed for ever. All sins, even of the OT people, are purged with the New Testament's blood of Jesus the Christ. The rest of the books in the N. T. clarify what Jesus really did. All of you folks that are trying to gain God's favor by your keeping of the Law need to realize that you will be justified by Grace through faith in the finished work or the "perfect law" of Christ.
Another confusing subject is sanctification which many people confuse with salvation works.... but, let's keep that for another blog....