It is not for a believer to kill a believer save by mistake; and whoever kills a believer by mistake then let him free a believing slave and compensation must be paid to his people, unless they remit it as charity. But if he be from a tribe hostile to you and yet a believer, then let him free a believing slave. And if he comes from a people betwixt whom and you there is an alliance, then let the compensation be paid to his folk and let him also free a believing slave. But he who cannot find the means, then let him fast for two consecutive months - a penance this from Allah, for Allah is Knower, Wise.