Deuteronomy 19:9-11

Complete Jewish Bible

⁹ provided you keep and observe all these mitzvot I am giving you today, loving Adonai your God and always following his ways — then you are to add three more cities for yourselves, besides these three; ¹⁰ so that innocent blood will not be shed in the land Adonai your God is giving you as an inheritance, and thus blood guilt be on you.

¹¹ “However, if someone hates his fellow member of the community, lies in wait for him, attacks him, strikes him a death blow, and then flees into one of these cities;