For it is Written: Pay attention and learn:
Let’s start with an emphasis on continuity. A passage like Matthew 5:17-19 can be used to argue that all Old Testament laws are still in force. Jesus didn’t do away with any of God’s laws. Rather, he emphasized that we ought to obey God not only in our actions, but also in our hearts. We have to keep every Old Testament law in the spirit, in its attitude and purpose. God’s laws are written in our hearts and minds (Hebrews 8:10). They are internalized, so we should want to keep them. Hebrews 8:10 is a quote of Jeremiah 31:31-33, one could argue, and the laws that Jeremiah had in mind were the laws that were valid in his day: the old covenant laws. They were all given by God.
If this line of reasoning is correct, our love for God will motivate us to be circumcised, to keep the Jubilee year and sabbatical years. We will be diligent to avoid all forms of uncleanness, and we will wear phylacteries and only pure fabrics. We will offer sacrifices, not only for sin but also for fellowship offerings and thank offerings. When Jeremiah described the kingdom of God, old covenant customs were included.
These laws are still valid – but, as we know, they are applied in a spiritual way. The application of the law has been transformed by the coming of Jesus Christ. If our hearts are circumcised, it does not matter whether we have been circumcised in the flesh. If we are offering spiritual sacrifices, we do not need to offer animals.
If we are always forgiving debts and liberating people from bondage, we do not have to do anything different on sabbatical years. If we are treating our livestock and farmland properly, we do not have to do anything different on sabbatical years. If we live by the spirit, the letter of these laws is not required.
If we examine our hearts for corruption and are being cleansed by Jesus Christ, then we do not have destroy houses that have mildew. If our thoughts are pure, we don’t have to worry about our fabrics. If we are always thinking of God and his laws, we don’t have to wear phylacteries. The laws are valid, but the way in which we obey them has been transformed by the coming of Jesus Christ.
The Old Testament clearly commanded the Israelites to wear blue threads in tassels on their garments (Numbers 15:38-39). Was this law inspired by God, or not? Answer: It was. Is this law obsolete? Answer: It is. Who has the authority to declare a God-given law obsolete? Answer: Only God.
Does the New Testament specifically rescind this law? Answer: No. It says nothing about this specific law. Then how can we prove, with divine authority, that it is obsolete? Answer: Because the New Testament declares the entire old covenant obsolete (Hebrews 8:13). As a law code, as a source of laws, it is not valid.
That brings us to our second approach to Old Testament law: None of it is valid. Christians do not have to keep the law of Moses because those laws were a temporary package, designed to be in force only until the Messiah came. Now that he has come and given us a better covenant, the first is obsolete.
But, some say, we should keep both the letter and the spirit of this law. It is easy to make that claim, but there is no proof for it – and there is certainly no reason to condemn people on the basis of a different interpretation of how we should obey God. It is just as easy to make the claim that people truly abiding by the spirit of the tassels will also be wearing tassels. The flaw of such logic is exposed by the realization that the new covenant declares the old contract obsolete. We must focus on the spirit and purpose of the laws.
A Sabbatarian approach to the Sabbath emphasizes Matthew 5:17-19, and that usually leads to a distorted meaning for such verses as Colossians 2:16 and Romans 14:5.
However, after we recognize that the letter of some Old Testament laws is obsolete, then we realize that Matthew 5:17-19 has to be qualified or restricted in some way. So do Romans 3:20, 31; 7:12, 14 and other verses of continuity. These verses do not tell us which specific laws are still in force, and they do not prove the continued validity of any specific law. They are general, not specific.
Once we recognize that some Old Testament laws, although still valid in purpose, are obsolete in the letter, then we are free to accept the implications of what Paul wrote in Colossians 2:16. We should not let anyone judge us regarding Sabbath days, just as we shouldn’t let them judge us regarding new moons. Everyone should be convinced in their own mind, and they should not judge other Christians regarding such matters.