Quran 4:93 — Women (Al-Nesa')

Anyone who kills a believer on purpose, his retribution is Hell, wherein he abides forever, GOD is angry with him, and condemns him, and has prepared for him a terrible retribution.

[4:92] No believer shall kill another believer, unless it is an accident. If one kills a believer by accident, he shall atone by freeing a believing slave, and paying a compensation to the victim's family, unless they forfeit such a compensation as a charity. If the victim belonged to people who are at war with you, though he was a believer, you shall atone by freeing a believing slave. If he belonged to people with whom you have signed a peace treaty, you shall pay the compensation in addition to freeing a believing slave. If you cannot find* a slave to free, you shall atone by fasting two consecutive months, in order to be redeemed by GOD. GOD is Knower, Most Wise.

[4:94] O you who believe, if you strike in the cause of GOD, you shall be absolutely sure. Do not say to one who offers you peace, "You are not a believer," seeking the spoils of this world. For GOD possesses infinite spoils. Remember that you used to be like them, and GOD blessed you. Therefore, you shall be absolutely sure (before you strike). GOD is fully Cognizant of everything you do.