Deuteronomy 19:8-10

Revised Standard Version

⁸ And if the Lord your God enlarges your border, as he has sworn to your fathers, and gives you all the land which he promised to give to your fathers— ⁹ provided you are careful to keep all this commandment, which I command you this day, by loving the Lord your God and by walking ever in his ways—then you shall add three other cities to these three, ¹⁰ lest innocent blood be shed in your land which the Lord your God gives you for an inheritance, and so the guilt of bloodshed be upon you.