You will find others who want to be secure from you, and secure from their own people. (But) whenever they are called back to the mischief, they are plunged into it. So, if they do not stay away from you, and do not offer peace to you, and do not restrain their hands, then seize them, and kill them wherever you find them, and, We have given you an open authority against them.

It is not for a believer (Muslim) to kill any believer, except by mistake. Whoever kills a believer by mistake, then, a believing slave has to be freed, and the blood money must be paid to his family, unless they forgo it.If he (the victim) belongs to a people hostile to you and is a believer, then, a believing slave has to be freed. 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. Whoever does not find one has to fast for two consecutive months. This is repentance prescribed from Allah’s side. Allah is All-Knowing, All-Wise.

Whoever kills a believer deliberately, his reward is Jahannam (Hell) where he shall remain forever, and Allah shall be angry with him and shall cast curse upon him, and He has prepared for him a mighty punishment.

O you who believe, when you go out in the way of Allah, be careful, and do not say to the one who offers you the Salām (salutation), “You are not a believer” to seek stuff of the worldly life. So, with Allah there are spoils in abundance. In the same state you were before; then Allah favored you. So, be careful. Surely, Allah is All-Aware of what you do.