Deuteronomy 17:6
17:6 At the testimony of two or three witnesses they must be executed. They cannot be put to death on the testimony of only one witness.
Deuteronomy 19:2
19:2 you must set apart for yourselves three cities 1 in the middle of your land that the Lord your God is giving you as a possession.
1 sn These three cities, later designated by Joshua, were Kedesh of Galilee, Shechem, and Hebron (Josh 20:7-9).