Numbers 35:31-33

Webster_Strongs(i)
  31 H3947 [H8799] Moreover ye shall take H3724 no satisfaction H5315 for the life H7523 [H8802] of a murderer H7563 , who is guilty H4191 [H8800] of death H4191 [H8800] : but he shall be surely H4191 [H8714] put to death.
  32 H3947 [H8799] And ye shall take H3724 no satisfaction H5127 [H8800] for him that hath fled H5892 to the city H4733 of his refuge H7725 [H8800] , that he should come again H3427 [H8800] to dwell H776 in the land H4194 , until the death H3548 of the priest.
  33 H2610 [H8686] So ye shall not pollute H776 the land H1818 in which ye are: for blood H2610 [H8686] it defileth H776 the land H776 : and the land H3722 [H8792] cannot be cleansed H1818 of the blood H8210 [H8795] that is shed H1818 in it, but by the blood H8210 [H8802] of him that shed it.