Numbers 35:21 Or in enmity smite him with his hand, that he die: he that smote him shall surely be put to death; for he is a murderer: the revenger of blood shall slay the murderer, when he meeteth him.
Moses was giving the laws of first and second-degree murder. An accidental murder or killing didn’t deserve the death penalty. The difference was intention or what was in the heart. If there was hatred in the heart of the killer, then it was not an accident even if he made it appear to be one!
What is in your heart when you say or do the things that hurt and wound your friend or brother? We might say we didn’t mean to hurt, but the truth is that our heart attitude will betray us. Out of the abundance of the heart, the mouth speaks.
I love how Moses gave good laws in what we might perceive to be primitive times. They had precise ways to determine if it was an accidental death or if it was murder. They weren’t savages that had no idea of right and wrong. The truths that they knew they got from the Lord God who we worship.