Deuteronomy 19:7-9

New Revised Standard Version, Anglicised

⁷ Therefore I command you: You shall set apart three cities.

⁸ If the Lord your God enlarges your territory, as he swore to your ancestors—and he will give you all the land that he promised your ancestors to give you, ⁹ provided you diligently observe this entire commandment that I command you today, by loving the Lord your God and walking always in his ways—then you shall add three more cities to these three,