A. Because men constantly broke the law, forgiveness was needed, and a blood sacrifice was required

LEV 16:8. And Aaron shall cast lots upon the two goats; one lot for the LORD, and the other lot for the scapegoat.

LEV 16:9. And Aaron shall bring the goat upon which the LORD's lot fell, and offer him for a sin offering.

LEV 16:10. But the goat, on which the lot fell to be the scapegoat, shall be presented alive before the LORD, to make an atonement with him, and to let him go for a scapegoat into the wilderness.

LEV 16:11. And Aaron shall bring the bullock of the sin offering, which is for himself, and shall make an atonement for himself, and for his house, and shall kill the bullock of the sin offering which is for himself:

LEV 16:15. Then shall he kill the goat of the sin offering, that is for the people, and bring his blood within the vail, and do with that blood as he did with the blood of the bullock, and sprinkle it upon the mercy seat, and before the mercy seat:

LEV 16:16. And he shall make an atonement for the holy place, because of the uncleanness of the children of Israel, and because of their transgressions in all their sins: and so shall he do for the tabernacle of the congregation, that remaineth among them in the midst of their uncleanness.

LEV 16:17. And there shall be no man in the tabernacle of the congregation when he goeth in to make an atonement in the holy place, until he come out, and have made an atonement for himself, and for his household, and for all the congregation of Israel.

LEV 16:18. And he shall go out unto the altar that is before the LORD, and make an atonement for it; and shall take of the blood of the bullock, and of the blood of the goat, and put it upon the horns of the altar round about.

LEV 16:19. And he shall sprinkle of the blood upon it with his finger seven times, and cleanse it, and hallow it from the uncleanness of the children of Israel.

LEV 16:20. And when he hath made an end of reconciling the holy place, and the tabernacle of the congregation, and the altar, he shall bring the live goat:

LEV 16:21. And Aaron shall lay both his hands upon the head of the live goat, and confess over him all the iniquities of the children of Israel, and all their transgressions in all their sins, putting them upon the head of the goat, and shall send him away by the hand of a fit man into the wilderness:

LEV 16:22. And the goat shall bear upon him all their iniquities unto a land not inhabited: and he shall let go the goat in the wilderness.

B. But this never permanently freed man from sin:

HEB 10:1. 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.

HEB 10:2. For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.

HEB 10:3. But in those sacrifices there is a remembrance again made of sins every year.

HEB 10:4. For it is not possible that the blood of bulls and of goats should take away sins.

HEB 10:11. And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:

C. But Jesus made a perfect & permanent sacrifice:

MAT 26:28. For this is my blood of the new testament, which is shed for many for the remission of sins.

HEB 9:7. But into the second went the high priest alone once every year, not without blood, which he offered for himself, and for the errors of the people:

HEB 9:8. The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing:

HEB 9:9. Which was a figure for the time then present, in which were offered both gifts and sacrifices, that could not make him that did the service perfect, as pertaining to the conscience;

HEB 9:10. Which stood only in meats and drinks, and divers washings, and carnal ordinances, imposed on them until the time of reformation.

HEB 9:11. But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building;

HEB 9:12. Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.

HEB 9:13. For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh:

HEB 9:14. How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?

HEB 9:25. Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others;

HEB 9:26. 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.

HEB 9:27. And as it is appointed unto men once to die, but after this the judgment:

HEB 9:28. 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.

HEB 10:10. By the which will we are sanctified through the offering of the body of Jesus Christ once for all.

HEB 10:11. And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:

HEB 10:12. But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;

1PE 1:18. Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;

1PE 1:19. But with the precious blood of Christ, as of a lamb without blemish and without spot:

1JO 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.

JOH 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.