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Surah 5. Al-Ma'ida
Ayah 32
32 مِنْ أَجْلِ ذَٰلِكَ كَتَبْنَا عَلَىٰ بَنِىٓ إِسْرَٰٓءِيلَ أَنَّهُۥ مَن قَتَلَ نَفْسًۢا بِغَيْرِ نَفْسٍ أَوْ فَسَادٍ فِى ٱلْأَرْضِ فَكَأَنَّمَا قَتَلَ ٱلنَّاسَ جَمِيعًا وَمَنْ أَحْيَاهَا فَكَأَنَّمَآ أَحْيَا ٱلنَّاسَ جَمِيعًا ۚ وَلَقَدْ جَآءَتْهُمْ رُسُلُنَا بِٱلْبَيِّنَـٰتِ ثُمَّ إِنَّ كَثِيرًا مِّنْهُم بَعْدَ ذَٰلِكَ فِى ٱلْأَرْضِ لَمُسْرِفُونَ
[32] That was why We prescribed this for the children of Israel:53 "He who killed any person, unless it be a person guilty of manslaughter, or of spreading chaos in the land, should be looked upon as though he had slain all mankind, and he who saved one life should be regarded as though he had saved the lives of all mankind."54 But the majority of them went on committing excesses in the land even after Our Messengers came to them one after the other with clear directions.
53That is, "Allah enjoined the Israelites to refrain from murder because they were showing the same murderous symptoms as had been shown by the cruel son of Adam. That is why such strict checks on murder were applied." But the pity is that these precious instructions are not found in the present Bible. The Talmud, however, says, "To him who kills a single individual of Israel, it shall be reckoned as if he had slain the whole race and he who preserves a single individual of Israel, according to the Book of Allah, he preserves the whole world." It also says that a judge of the Israelites in a case of murder would warn the witness saying, "To him who kills a single individual of Israel, it shall be reckoned as if he has slain the whole race."
54This is to emphasize the sanctity of human life: it is essential for the preservation of human life that everyone should regard the life of the other as sacred and help to protect it. The one who takes the life of another without right, does not commit injustice to that one alone, but also proves that he has no feeling for the sanctity of human life and of mercy for others. Hence he is most surely the enemy of the whole human race, for if every individual suffered from the same kind of hard-heartedness, the whole human race would come to an end. On the contrary, if one helps to preserve a single human life, he is indeed a helper of all mankind for he possesses those qualities upon which depends the survival of the whole human race.