Deuteronomy 4:41-43

41Then Moses chose three special cities on the east side of the Jordan River.

42If someone killed another person when he did not mean to do it, he could hide there safely. If he had not hated the other person as his enemy, he could run to one of these cities. Then he would be safe.

43Moses chose these cities: For Reuben's tribe, he chose Bezer, in the high land of the desert. For Gad's tribe, he chose Ramoth, in Gilead. For Manasseh's tribe, he chose Golan, in Bashan.