Heb 8:7-13, 9:18-26, 13:20, Mt 26:28, Mk 14:24, Lk 22:20, 1 Cor 11:25
In the Old Testament, God gave the Israelites a covenant to forgive their sins through a burnt offering. (Ex 24:4-8)
Ex 24:4 And Moses wrote all the words of the Lord, and rose up early in the morning, and builded an altar under the hill, and twelve pillars, according to the twelve tribes of Israel. 5 And he sent young men of the children of Israel, which offered burnt offerings, and sacrificed peace offerings of oxen unto the Lord. 6 And Moses took half of the blood, and put it in basons; and half of the blood he sprinkled on the altar. 7 And he took the book of the covenant, and read in the audience of the people: and they said, All that the Lord hath said will we do, and be obedient. 8 And Moses took the blood, and sprinkled it on the people, and said, Behold the blood of the covenant, which the Lord hath made with you concerning all these words.
The covenant God gave to the Israelites was not perfect. Rather, God gave the first covenant to explain the new covenant. God's new covenant is to engrave God's word in our hearts. This was accomplished when we believed in Jesus as the Christ. (Hebrews 8:7-13, Acts 5:30-32)
Hebrews 8:7 For if that first covenant had been faultless, then should no place have been sought for the second. 8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah: 9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord. 10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people: 11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest. 12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more. 13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
Acts 5:30 The God of our fathers raised up Jesus, whom ye slew and hanged on a tree. 31 Him hath God exalted with his right hand to be a Prince and a Saviour, for to give repentance to Israel, and forgiveness of sins. 32 And we are his witnesses of these things; and so is also the Holy Ghost, whom God hath given to them that obey him.
In order to save us, Jesus offered his body to God as a perfect and eternal sacrifice once and for all. (Heb 9:18-26)
Heb 9:18 Whereupon neither the first testament was dedicated without blood. 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, 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.
Jesus is God's new covenant, the Christ, who made us alive with His blood. (Luke 22:20, 1 Corinthians 11:25, Hebrews 13:20, Matthew 26:28, Mark 14:24)
Luke 22:20 Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
1 Corinthians 11:25 After the same manner also he took the cup, when he had supped, saying, this cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
Hebrews 13:20 Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep, through the blood of the everlasting covenant,
Matthew 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
Mark 14:24 And he said unto them, This is my blood of the new testament, which is shed for many.