Please compare how a man acquired the following things in the Old Testament vs New Testament. The WORDS speak for themselves. Things that are different are not the same.
OT – Deut 32:46,47 – “And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law. For it is not a vain thing for you; because it is your life: and through this thing ye shall prolong your days in the land, whither ye go over Jordan to possess it.” Doing the Law is your life. Notice that this is a work “to do”.
NT – Col 3:4 – “When Christ, who is our life, shall appear, then shall ye also appear with him in glory.” Christ is your life.
OT – Heb 10:11 – “And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:” There were many physical sacrifices and offerings in the OT. The practice of sacrifice is clearly a work.
NT – Heb 10:10, 12 – “By the which will we are sanctified through the offering of the body of Jesus Christ once for all… But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;” The physical sacrifices are completed in Christ.
OT – Lev 6:4-7 “Then it shall be, because he hath sinned, and is guilty, that he shall restore that which he took violently away, or the thing which he hath deceitfully gotten, or that which was delivered him to keep, or the lost thing which he found, Or all that about which he hath sworn falsely; he shall even restore it in the principal, and shall add the fifth part more thereto, and give it unto him to whom it appertaineth, in the day of his trespass offering. And he shall bring his trespass offering unto the LORD, a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: And the priest shall make an atonement for him before the LORD: and it shall be forgiven him for any thing of all that he hath done in trespassing therein.” God forgave sins on the basis of a physical sacrifice. Again, sacrifices in the OT were works, not faith.
NT – Col 1:14 – “In whom we have redemption through his blood, even the forgiveness of sins:” Christ’s blood gives forgiveness.
OT – Lev 16:27-30 – “And the bullock for the sin offering, and the goat for the sin offering, whose blood was brought in to make atonement in the holy place, shall one carry forth without the camp; and they shall burn in the fire their skins, and their flesh, and their dung. And he that burneth them shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp. And this shall be a statute for ever unto you: that in the seventh month, on the tenth day of the month, ye shall afflict your souls, and do no work at all, whether it be one of your own country, or a stranger that sojourneth among you: For on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the LORD.” Sacrifices by the high priest cleansed.
NT – I John 1:7 – “But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.” Christ’s blood cleansed.
OT – Deut 6:25 – “And it shall be our righteousness, if we observe to do all these commandments before the LORD our God, as he hath commanded us.” Righteousness came from observing the Law. This would be works, not faith.
NT – Rom 3:22 – “Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:” Righteousness from believing in Jesus Christ.
IMPOSSIBLE IN OT – Ex 23:7 – “Keep thee far from a false matter; and the innocent and righteous slay thou not: for I will not justify the wicked.” Exception is Abraham (Jam 2:21) who was justified by works.
NT – Rom 5:1 – “Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:” Through faith, God justifies wicked sinners.
Clearing, Blotting Out Sins
IMPOSSIBLE IN OT – Ex 34:6,7 – “And the LORD passed by before him, and proclaimed, The LORD, The LORD God, merciful and gracious, longsuffering, and abundant in goodness and truth, Keeping mercy for thousands, forgiving iniquity and transgression and sin, and that will by no means clear the guilty; visiting the iniquity of the fathers upon the children, and upon the children’s children, unto the third and to the fourth generation.” God won’t clear the guilty.
NT – Col 2:13-14 – “And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses; Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; ” Sins are blotted out and taken out of the way.
Taking Away Sins
IMPOSSIBLE IN OT – Heb 10:1-4 – “For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect. For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins. But in those sacrifices there is a remembrance again made of sins every year. For it is not possible that the blood of bulls and of goats should take away sins.” Sacrifices couldn’t take away sins.
NT – John 1:29 – “The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.” Sin taken away in Christ.
Please note that because Justification and Taking Away Sins was impossible in the Old Testament, OT saints didn’t go to heaven, they were taken to Abraham’s Bosom (see Luke 16). There they waited until Christ could finish their salvation and take them to heaven (Eph 4:8). They needed Christ to die in order to get to heaven because he is the way, the truth, and the life and no man cometh unto the Father but by him. “Looking forward to the cross is unscriptural nonsense.