Deuteronomy 27:24; Numbers 35:33

24 nCursed be anyone who strikes down his neighbor in secret. And all the people shall say, Amen.

33 You shall not mpollute the land in which you live, for blood mpollutes the land, and no atonement can be made for the land for the blood that is shed in it, except nby the blood of the one who shed it.