In the Sermon on the Mount, Jesus equates anger with murder (Matt. 5:21-22), in much the same way He equates lust with adultery (Matt. 5:27-28). Later, John adds the following:
1 John 3:11-15 - For this is the message that you heard from the beginning, that we should love (agapaō) one another, not as Cain who was of the wicked one and murdered his brother. And why did he murder him? Because his (Cain) works were evil and his brother’s (Able) righteous. Do not marvel (wonder, be surprised, astonished), my brethren (fellow believers), if the world (kósmos) hates (to detest, an active ill will in words and conduct, a persecution spirit) you. We know (eidō) that we have passed from death to life, (how) because we love (agapaō) the brethren. He who does not love (agapaō) his (personal) brother (fellow believers) abides (rest, make their home) in death. Whoever hates (to detest, an active ill will in words and conduct, a persecution spirit) his (personal) brother (fellow believer) is a murderer, and you know (eidō) that no murderer has eternal life abiding in him.
John also equates anger and hatred with murder. And he states that "no murderer has eternal life abiding in him." This is a profoundly important point. Which raises a couple of questions:
Have you been angry with a fellow Christian?
What was the cause of your anger? Was it the holiness of God? Or some personal preference about which you felt slighted?
Are you still angry with that person? And if so, why?
Did you know that, according to the Scriptures, you are guilty of murder? Why? Because the one you hate and murmur about was created in the image of God. And to hate someone created by God, who is also made in the image of your God, is to hate God. You cannot love the Creator and hate His creation.
The Scriptures call this murder. Are you confused? Do you think hatred and murder are two different things with two different penalties? Do you want to know what the Scriptures say about anger and murder? Then keep listening.