About 1,500 years before Christ, Moses said:
You shall not murder.
– Exodus 20:13
Then when Christ came, He said:
“You have heard that the ancients were told, ‘YOU SHALL NOT COMMIT MURDER’ and ‘Whoever commits murder shall be liable to the court.’ But I say to you that everyone who is angry with his brother shall be guilty before the court; and whoever says to his brother, ‘You good-for-nothing,’ shall be guilty before the supreme court; and whoever says, ‘You fool,’ shall be guilty enough to go into the fiery hell.
– Matthew 5:21-22
(By the way, “the fiery hell” is not referring to the afterlife but rather judgment and wrath in this life.)
Thus, God sent Moses to tell his fellow Israelites not to kill each other, but Jesus came to tell human beings not to even hate each other. (Though it’s become unfashionable to say it, it is absolutely true, practical, and important that we hate the sin and love the sinner.)
If you’ve never killed anyone, that’s good. But have you ever harbored anger or bitterness in your heart toward anyone? If you want to be right with Jesus, you have to do something about that.
Here’s how the apostle John put the matter:
If someone says, “I love God,” and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
– 1 John 4:20
Therefore, shun hatred as much as you shun murder.
I’m just telling you how to stay on Jesus’ good side and avoid wrath in this life. If you don’t care about doing that, you can just ignore what I’m saying.