Jesus Teaches About the Old Law

Here Jesus talks about the Old Testament:

Matthew 5:17-20 NIV

[17]  “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. [18] For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. [19] Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. [20] For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.

First of all, Jesus fulfilled everything in the Old Law and the Prophets.We live by faith. We put our faith and hope in God as we are in Christ. We are under HIS direct supervision, not the Old Law as Paul explains in Galatians:

Galatians 3:15-25 NIV

[15] Brothers and sisters, let me take an example from everyday life. Just as no one can set aside or add to a human covenant that has been duly established, so it is in this case. [16] The promises were spoken to Abraham and to his seed. Scripture does not say “and to seeds,” meaning many people, but “and to your seed,” meaning one person, who is Christ. [17] What I mean is this: The law, introduced 430 years later, does not set aside the covenant previously established by God and thus do away with the promise. [18] For if the inheritance depends on the law, then it no longer depends on the promise; but God in his grace gave it to Abraham through a promise. [19] Why, then, was the law given at all? It was added because of transgressions until the Seed to whom the promise referred had come. The law was given through angels and entrusted to a mediator. [20] A mediator, however, implies more than one party; but God is one. [21] Is the law, therefore, opposed to the promises of God? Absolutely not! For if a law had been given that could impart life, then righteousness would certainly have come by the law. [22] But Scripture has locked up everything under the control of sin, so that what was promised, being given through faith in Jesus Christ, might be given to those who believe. [23] Before the coming of this faith, we were held in custody under the law, locked up until the faith that was to come would be revealed. [24] So the law was our guardian until Christ came that we might be justified by faith. [25] Now that this faith has come, we are no longer under a guardian.

Romans 7:1-6 NIV

[1] Do you not know, brothers and sisters—for I am speaking to those who know the law—that the law has authority over someone only as long as that person lives? [2] For example, by law a married woman is bound to her husband as long as he is alive, but if her husband dies, she is released from the law that binds her to him. [3] So then, if she has sexual relations with another man while her husband is still alive, she is called an adulteress. But if her husband dies, she is released from that law and is not an adulteress if she marries another man. [4] So, my brothers and sisters, you also died to the law through the body of Christ, that you might belong to another, to him who was raised from the dead, in order that we might bear fruit for God. [5] For when we were in the realm of the flesh, the sinful passions aroused by the law were at work in us, so that we bore fruit for death. [6] But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.

So why is the Old Law still around if we live by faith in our Lord Jesus Christ?

The Old Testament teaches us what sin is.

Romans 7:7 NIV

[7] What shall we say, then? Is the law sinful? Certainly not! Nevertheless, I would not have known what sin was had it not been for the law. For I would not have known what coveting really was if the law had not said, “You shall not covet.” 

The Old Testament teaches us what sin is. Although we are in Christ now and not under the Old Law. We live by faith and not the "written code." 

Jesus is teaching here that the Old Testament would always be important as it tells us what sin is. So we still teach from it to show people what sin is. 

So, we live by faith in Christ Jesus and His finished work. We live under God's grace, while the Old Testament teaches us what sin is.

"We are not under the Law, but under grace."

Love you all dear readers,

Jeffrey Post

PS-The remainder of His Sermon on the Mount He talks about things in the Old Law and sets a new standard for us to live by. Stay tuned....