Summary: Lesson 12
The use of the terms "the law" and "the prophets" indicates that what the Lord is speaking of in these verses is the whole of the Old Testament. In Luke 24:44 (quickview)  Jesus said, "These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me." The "law of Moses", "the prophets", and "the psalms" speak of the entirety of the Old Testament.
Many are confused today about the Christian’s relationship to the Old Testament. Many view it as outdated, irrelevant, and of absolutely no value to the New Testament Christian. However, the words of Paul speak differently (Romans 15:4 (quickview) 1 Corinthians 9:9-10 (quickview) , 10:11; 2 Timothy 3:16-17 (quickview) ).
In reference to the Old Testament Scriptures, Christ tells us that Everything is to be Heeded, Nothing is to be Mistreated, and Something is to be Exceeded.
I. EVERYTHING IS TO BE HEEDED vs. 17-18
A. The Old Testament is Approved
1. In these verses the Lord puts His seal of approval upon the whole of the Old Testament.
2. All one has to do is read the four gospels and take note of the Lord’s frequent quotation of Old Testament verses, and they will quickly discover that Jesus believed in and approved the Old Testament.
B. The Old Testament is Absolute
1. God’s Word, as written in the Old Testament, is not to be modified or changed to the slightest extent.
2. From the smallest letter in the Hebrew alphabet (the "jot") to the smallest Hebrew marking (the "tittle"), the Word of God in the Old Testament is to be considered absolute and eternal.
C. The Old Testament is Authoritative
1. Jesus recognized the authority of the Old Testament writings and it was not His plan to destroy or modify them in any way. His purpose rather was to fulfil and to carry them out, and to give them perfect obedience.
2. To question the authority of the Old Testament is to question the authority of Jesus Himself, which will bring about endless trouble and difficulty.
II. NOTHING IS TO BE MISTREATED v. 19
It is imperative that we preach and practice the entire Word of God, including the Old Testament (Psalm 119:6 (quickview) , 128). Even matters that may seem insignificant are of great importance.
A. The Danger of Disobeying
2. It is equally as dangerous to lead others in the same transgression (Peter 2:1-3).
B. The Delight of Obeying
1. There is great delight, not only in doing right ourselves, but in helping others do right as well.
2. There is a certain "greatness" pronounced upon those who follow righteousness and who encourage others to do the same.
III. SOMETHING IS TO BE EXCEEDED v. 20
The scribes and the Pharisees had wise heads in that they were some of the most intellectual men in all Israel. They had willing hands. They would go to any length in order to make a convert and would do whatever it took to insure that they did not miss a ceremony. But in spite of their wise heads and willing hands, they had wicked hearts.