The Quran states: “If someone kills another person unless it is in retaliation for someone else or for causing corruption on the Earth, it is as if he had murdered all mankind.” (5:32) Considering murder as a horrendous act, Islam states that killing a single person without proven justification is equal to killing all human beings. Killing one human being is just as horrendous as killing all human beings. Such a killing breaks all traditions of respect for life. The above Quranic verse shows the great importance of peace and security in Islam. If someone is unjustly killed, it should be treated as a matter of the greatest urgency, as if all of humanity were under attack.

Source: Shared Wisdom