Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment: But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
The Jews of Jesus’ time knew that murder was forbidden by God and that the murderer was liable to punishment. Jesus instituted a new commandment to the teaching on murder. He traced the act of murder to its source and warns against three forms of unrighteous anger – 1.) the one who is angry with another without a cause, 2.) the one who insults another, 3.) the one who calls another “fool”. Jesus taught that anger contains the seeds of murder, that abusive language contains the spirit of murder, and that cursing language implies the very desire to murder.