

"It is not for a believer to kill any believer, except by mistake. And whoever kills a believer by mistake, then, a believing slave has to be freed and the blood money paid to his family, unless they forgo it. And if he (the victim) belongs to a people hostile to you and is a believer, then, a believing slave has to be freed. And if he (the victim) belongs to a people between whom and you there is treaty, then, blood money is to be paid to his family, and a believing slave to be freed. And whoever does not find one has to fast for two consecutive months. This is a relenting from Allah. And Allah is All-Knowing, All-Wise. [92]
And whoever kills a believer deliberately, his reward is Jahannam where he shall remain for ever and Allah shall be angry with him and shall cast curse upon him and he has prepared for him a mighty punishment."[93] (4:92-93