Matthew 5:17-21 King James Version (KJV)
17 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.
19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
20 For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
21 Ye have heard that it was said of them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
Matthew 5:17-21 Common English Bible (CEB)
Jesus and the Law
17 “Don’t even begin to think that I have come to do away with the Law and the Prophets. I haven’t come to do away with them but to fulfill them. 18 I say to you very seriously that as long as heaven and earth exist, neither the smallest letter nor even the smallest stroke of a pen will be erased from the Law until everything there becomes a reality. 19 Therefore, whoever ignores one of the least of these commands and teaches others to do the same will be called the lowest in the kingdom of heaven. But whoever keeps these commands and teaches people to keep them will be called great in the kingdom of heaven. 20 I say to you that unless your righteousness is greater than the righteousness of the legal experts and the Pharisees, you will never enter the kingdom of heaven.
Law of murder
21 “You have heard that it was said to those who lived long ago, Don’t commit murder,[a] and all who commit murder will be in danger of judgment.