for bloodshed pollutes the land: If the person who caused a death, whether murder or accidental killing, was not treated as the law commanded, God viewed the land as polluted.
Human bloodshed required death as a response (Genesis 4:10–11; 9:6). This rule is different from cases such as Exodus 21:29–30 (see also Leviticus 18:28; Ezekiel 36:17–18; Hosea 4:2–3).
This strong warning about murder shows the great value of human life (Exodus 20:13).