Deuteronomy 21:1-3

American Standard Version

21 If one be found slain in the land which Jehovah thy God giveth thee to possess it, lying in the field, and it be not known who hath smitten him; ² then thy elders and thy judges shall come forth, and they shall measure unto the cities which are round about him that is slain: ³ and it shall be, that the city which is nearest unto the slain man, even the elders of that city shall take a heifer of the herd, which hath not been wrought with, and which hath not drawn in the yoke;