Responsibilities Imposed on Us by the Verses of the Holy Quran 39
4. Sūrat An-Nisā’ (The Women) (11)
In the Name of Allāh, the Most Gracious, the Most Merciful.
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91. You will find others that wish to have security from you and security from their people. Every time they are sent back to temptation, they yield thereto. If they withdraw not from you, nor offer you peace, nor restrain their hands, take (hold of) them and kill them wherever you find them. In their case, We have provided you with a clear warrant against them.
92. It is not for a believer to kill a believer, except (that it be) by mistake; and whosoever kills a believer by mistake, (it is ordained that) he must set free a believing slave and a compensation (blood?money, i.e. Diya) be given to the deceased’s family, unless they remit it. If the deceased belonged to a people at war with you and he was a believer, the freeing of a believing slave (is prescribed); and if he belonged to a people with whom you have a treaty of mutual alliance, compensation (blood?money, i.e. Diyah) must be paid to his family, and a believing slave must be freed. And whoso finds this (the penance of freeing a slave) beyond his means, he must fast for two consecutive months in order to seek repentance from Allāh. And Allāh is Ever All?Knowing, All?Wise.
93. And whoever kills a believer intentionally, his recompense is Hell to abide therein; and the Wrath and the Curse of Allāh are upon him, and a great punishment is prepared for him.