De 19:3 "You shall prepare roads for yourself, and divide into three parts the territory of your land which the LORD your God is giving you to inherit, that any manslayer may flee there.
4 "And this is the case of the manslayer who flees there, that he may live: Whoever kills his neighbor unintentionally, not having hated him in time past-
5 "as when a man goes to the woods with his neighbor to cut timber, and his hand swings a stroke with the ax to cut down the tree, and the head slips from the handle and strikes his neighbor so that he dies-he shall flee to one of these cities and live;
6 "lest the avenger of blood, while his anger is hot, pursue the manslayer and overtake him, because the way is long, and kill him, though he was not deserving of death, since he had not hated the victim in time past.
7 "Therefore I command you, saying, 'You shall separate three cities for yourself.'
God's lesson here is that accidents can be avoided if we are extra careful with the lives of others, if we would but go the extra mile in making them safe. Make sure that the axe head is secure. Get people to be safely distant from you. Focus on your driving. Learn how to drive defensively etcetera.
A lot of times, unbeknownst to us, we have this deadly unconcern for the safety of others. If we learn to study ourselves, we will notice this in us in the little things in our day to day activities.
As the killer flees from the avenger of blood, he would be extra careful with his own life. He would make sure that every move he makes would be safe from him. And God says to him at that point: "Object lesson! That's what you should have done with the life of your brother."
