Numbers 35:12

¹⁰  Speak unto the children of Israel, and say unto them, When ye be come over Jordan into the land of Canaan;

¹¹  Then ye shall appoint you cities to be cities of refuge for you; that the slayer may flee thither, which killeth any person at unawares.

¹²  And they shall be unto you cities for refuge from the avenger; that the manslayer die not, until he stand before the congregation in judgment.

¹³  And of these cities which ye shall give six cities shall ye have for refuge.

¹⁴  Ye shall give three cities on this side Jordan, and three cities shall ye give in the land of Canaan, which shall be cities of refuge.