She said, “Your Majesty, please pray to the Lord your God, so that my relative who is responsible for avenging the death of my son will not commit a greater crime by killing my other son.” “I promise by the living Lord,” David replied, “that your son will not be harmed in the least.”
In the past, even when Saul was still our king, you led the people of Israel in battle, and the Lord your God promised you that you would lead his people and be their ruler.”
Long ago a place was prepared where a huge fire will burn the emperor of Assyria. It is deep and wide, and piled high with wood. The Lord will breathe out a stream of flame to set it on fire.
For example, if two of you go into the forest together to cut wood and if, as one of you is chopping down a tree, the ax head comes off the handle and kills the other, you can run to one of those three cities and be safe.
If there were only one city, the distance to it might be too great, and the relative who is responsible for taking revenge for the killing might catch you and angrily kill an innocent person. After all, it was by accident that you killed someone who was not your enemy.
to which a man could escape and be safe if he had accidentally killed someone who had not been his enemy. He could escape to one of these cities and not be put to death.