Deuteronomy 21:1-3

Young's Literal Translation

21 `When one is found slain on the ground which Jehovah thy God is giving to thee to possess it -- fallen in a field -- it is not known who hath smitten him,

² then have thine elders and thy judges gone out and measured unto the cities which [are] round about the slain one,

³ and it hath been, the city which [is] near unto the slain one, even the elders of that city have taken a heifer of the herd, which hath not been wrought with, which hath not drawn in the yoke,