Jesus was not speaking of the Torah in Matthew 5, or else it would still remain to be observed until this day.
Ephesians 2:15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
Matthew 5:17-18 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
If this was literally speaking about the Torah, this passage would be utterly confusing. For then Jesus would be saying, "I am not come to destroy, but to abolish it". Destroy is a synonym of abolish. That forces the Scriptures to contradict, and cannot possibly be right. Now the underlined text says, "Til heaven and earth pass". Have heaven and earth passed away? If not, why are we saying that the commandment which refers to the creation of heaven and earth, has passed away? What's more, is that there's actually a prophecy that speaks of the passing away of heaven and earth.
Isaiah 66:22-23 For as the new heavens and the new earth, which I will make, shall remain before me, saith the LORD, so shall your seed and your name remain. 23 And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.
Even in the new heavens, and new earth, the Sabbath will still be kept. Why? Because Jesus better explains in Luke what He meant when He said the law would not pass away.
Luke 16:17 And it is easier for heaven and earth to pass, than one tittle of the law to fail.