Numbers 35:13-15 (NKJV)
[15] These six cities shall be for refuge for the children of Israel, for the stranger, and for the sojourner among them, that anyone who kills a person accidentally may flee there.
[13] And of the cities which you give, you shall have six cities of refuge.
[14] You shall appoint three cities on this side of the Jordan, and three cities you shall appoint in the land of Canaan, which will be cities of refuge. [15] These six cities shall be for refuge for the children of Israel, for the stranger, and for the sojourner among them, that anyone who kills a person accidentally may flee there.