Deuteronomy 19:2 ASV

¹  When Jehovah thy God shall cut off the nations, whose land Jehovah thy God giveth thee, and thou succeedest them, and dwellest in their cities, and in their houses;

²  thou shalt set apart three cities for thee in the midst of thy land, which Jehovah thy God giveth thee to possess it.

³  Thou shalt prepare thee the way, and divide the borders of thy land, which Jehovah thy God causeth thee to inherit, into three parts, that every manslayer may flee thither.

⁴  And this is the case of the manslayer, that shall flee thither and live: whoso killeth his neighbor unawares, and hated him not in time past;