Matthew 5:17-18

V.17. Think not that I am come to destroy the law or the prophets; I am not come to destroy, but to fulfill.

Because Christ the Lord entrusted and strongly commended the office to the apostles, he now goes further and himself begins both to salt and to shine as an example for them, that they may know what they are to preach; and attacks both the teaching and the life of the Jews, to rebuke and to reform their wrong notions and doings; although here, as I have said, he does not treat of the great principal doctrine of faith; but first he begins below, and rightly explains and extols the law, which was greatly obscured and perverted by their Pharisees and Scribes. For that is also a very important matter, that one should make the teaching of God’s commands clear and set them forth correctly.

But it is a sharp, unendurable salt, that he attacks and condemns these people as neither teaching nor living aright, and finds fault with them in everything, who were yet the very best and holiest, who were daily teaching the commands of God, and were exercising themselves in holy worship, etc., so that no one could rebuke them; he gave them thereby occasion to fiercely exclaim against him, and to accuse him of wishing to undermine and destroy the law which God had given, etc.’ just as the Pope and his crowd cry out against us, and denounce us as heretics who forbid the doing of good works. So he foresaw very well that he would be thus charged, and that his teaching would be interpreted in this way. Therefore he anticipates with a preface and explanation that it is not his intention to undermine the law; but that he is here for the very purpose of rightly teaching and confirming it against those who would weaken it by their teaching.

For there was surely need of such a statement, on account of the high reputation that they had, and in view of the excellent show that they knew how to make and dress up, that they alone were the people of God, that they had so many prophets and holy fathers, that whoever ventured to rebuke them would have to hear at once: Who art thou, that thou wilt be alone wise and blame everybody, as though our fathers and we have all been in error, who have the word of God and preach it? Just as the whole world is now howling at us, and saying we condemn the holy fathers and the whole Church that surely cannot err, because it is ruled by the Holy Ghost, etc. Because thou art blaming our doctrine and life, this is a sign that thou condemnest both the law and the prophets, the fathers and the whole people. To this now Christ replies: No, I will surely not destroy the law or the prophets, but I hold them in honor and insist upon their observance more earnestly and diligently than you do; yes, so earnestly that heaven and earth shall pass away before I will allow a letter or the smallest tittle to perish or to have been written in vain; yes, I will still further say, that whosoever despises the very least commandment or teaches otherwise, he shall on account of this very smallest thing in the kingdom of heaven be rejected, although he rightly kept all the rest. Therefore we agree upon this point, that we are strictly to teach and observe Moses and the prophets; but the point now is, since we both are required to and wish to teach the law (as also now both parties, viz. the Pope together with the other crowds, and we appeal to the same Scriptures, exalt at the same time the one gospel and word of God), that one may be sure which side rightly holds and interprets the Scriptures or the laws of God, or which does not. About this there is dispute. Here I must salt and rebuke. For the Jews with their glosses have perverted and corrupted the law: and I have come to set things right again; just as we have had to attack the preachings of the Pope, that have corrupted for us the Scriptures with their stench and filth.

He does not thereby deny that they are the people of God, and have the law, the fathers and the prophets; just as we do not deny or condemn the Christians, baptism, gospel, that were under the Pope, but we say, it is the right baptism, gospel, etc., that we have. But we fight against accepting what they have daubed over them, and approving of the way in which they interpret and pervert them, and have defiled the pure doctrine with their nasty and maggoty, yes devilish appendage of their hoods, tonsures, indulgences, purgatory, sacrificial masses, etc. Here we have to salt and work, that we may clear out this stench and make things clean. So it appears that just those who are really destroying the law and the Scriptures adorn themselves with the beautiful name of the Scriptures, the gospel, the Christian Church, etc., and, under this pretense, bring in their maggots, and have so corrupted the church as to rob it of its value; and then they make an ado about us, that we are assailing the Christian Church, the holy fathers, good works, etc.

He now says: I am not come to destroy the law, but to fulfill it; that is, I will not bring another or a new law, but will take the Scriptures that you have and properly extol them, and explain them in such a way that you may know how we are to demean ourselves. For the Gospel or the preach-lug of Christ does not bring a new doctrine which neutralizes or changes the law; but just that (as St. Paul says) which was promised before in the Scriptures and by the prophets. We accept, therefore, from those who are with us the very same Scriptures, baptism, sacraments, etc., which they have, and do not wish to propose anything new or better. But this we do for the sole purpose that the same may be rightly preached and treated, and that whatever does not accord with it may be taken out of the way.

St. Augustine explains the word “fulfill” in two ways; first, that fulfilling the law means when one adds to the law what it lacks; and secondly, when one fulfills it by working and living. But the first explanation is wrong. For the law is in itself so rich and perfect that one need add nothing to it. For the apostles themselves had to prove the gospel and the preaching concerning Christ out of the Old Testament. Therefore no one, not even Christ himself, can improve the law. For what can be devised or taught higher than the teaching of the first commandment: Thou shalt love God with all thy heart, etc.? He does this, however, that he gives in addition to the law and the doctrine his grace and Spirit, so that one may do and fulfill what the law demands; but that does not mean adding anything to the law.

And so he is here not speaking about that, but of the fulfilling that is done by teaching; just as he defines destroying, not as acting against the law by works, but as detracting from the law by teaching. Therefore we have the same truth here that St. Paul utters in Romans 3:31: “Do we then make void the law through faith? God forbid; yea, we establish the law,” namely, that he does not mean to bring another doctrine, as though the former one were no longer to avail; but he means to preach and extol the same properly, to show the real kernel and meaning of it, that they may learn what the law is and demands, over against the glosses of the Pharisees, which they have inserted, and have preached only the shells or husks of it. Just as we may say to our papistic friends: we do not wish to abolish your gospel or preach it differently, but to clean it off and polish it, as a mirror that is dimmed and soiled by your filth, so that nothing more than the name of the gospel is left, but no one could rightly see anything in it: so the Jewish teachers kept the text of the law, but with their additions so corrupted it that no correct understanding or use of it could remain.

V.18. For verily I say unto you, Till heaven and earth pass, one jot or tittle shall in no wise pass from the law, till all be fulfilled.

That is, I insist upon it, that it must all be taught and held pure and entire, and not the least part of it be done away; whereby he shows that he found it far otherwise, namely, that both doctrine and life had not been rightly conducted. Therefore he must (as here follows) take in hand both of these and thoroughly salt them, that there may be a purification. So also must we teach that we do not allow a letter to be detached from the gospel, but say:

Everything must be taught, believed and held purely. He thus intimates that he is about to preach a sharp sermon, and will not lie under the charge that he means to destroy the law; but will turn the attack from himself upon them, and prove how they have weakened and destroyed the law, and for this have daubed their glosses over it. Just as our papistic neighbors have done with the gospel and the Scriptures, when they utterly ignored the most important topic, justification by faith; also, they have withheld one form from the sacrament and concealed the words of the sacrament; yes, they have so coarsely misrepresented, that they have preached these commandments which Christ here announces, not as necessary statutes, but as merely good counsels, directly contrary to these words and stipulations, that sooner heaven and earth must pass away than that one of the least of these be not observed. Thereupon he at once passes an earnest sentence upon such preachers, as follows:

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