Deuteronomy 19:2-4

Revised Standard Version Catholic Edition

² you shall set apart three cities for you in the land which the Lord your God gives you to possess. ³ You shall prepare the roads, and divide into three parts the area of the land which the Lord your God gives you as a possession, so that any manslayer can flee to them.

⁴ “This is the provision for the manslayer, who by fleeing there may save his life. If any one kills his neighbor unintentionally without having been at enmity with him in time past—