Numbers 35:34

Defile not the land wherein I dwell It is often assigned as a reason why they should put away all polluted persons and things out of their camp and land, because God dwelt in them, by his peculiar presence, whence this land was called the Holy Land. It is the case of all crimes, that they defile the land in which they are committed, and render it odious and unclean in the sight of God; but it is more especially true of murder, which is the highest of all injuries against human society, and against God, in whose image man was created.