14 Ye shall give three cities on this side of Jordan, and three cities shall ye give in the land of Canaan, which shall be cities of refuge.
Numbers 35:14 Cross References - Webster
Deuteronomy 4:41-43
41 Then Moses set apart three cities on the side of Jordan, towards the sun-rising;
42 That the slayer might flee thither, who should kill his neighbor unawares, and when he had not hated him in times past; and that fleeing to one of these cities he might live:
43 Namely, Bezer in the wilderness, in the plain country, of the Reubenites; and Ramoth in Gilead, of the Gadites; and Golan in Bashan, of the Manassites.
Deuteronomy 19:8-10
8 And if the LORD thy God shall enlarge thy limits, as he hath sworn to thy fathers, and give thee all the land which he promised to give to thy fathers;
9 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, besides these three:
10 That innocent blood may not be shed in thy land, which the LORD thy God giveth thee for an inheritance, and so blood be upon thee.