Deuteronomy 19:9

9 because you carefully follow all these laws I command you today—to love the LORD your God and to walk always in obedience to him—then you are to set aside three more cities.

Read Deuteronomy 19:9 Using Other Translations

If thou shalt keep all these commandments to do them, which I command thee this day, to love the LORD thy God, and to walk ever in his ways; then shalt thou add three cities more for thee, beside these three:
provided you are careful to keep all this commandment, which I command you today, by loving the LORD your God and by walking ever in his ways--then you shall add three other cities to these three,
you must designate three additional cities of refuge. (He will give you this land if you are careful to obey all the commands I have given you—if you always love the LORD your God and walk in his ways.)