الآية رقم (91) - سَتَجِدُونَ آخَرِينَ يُرِيدُونَ أَن يَأْمَنُوكُمْ وَيَأْمَنُواْ قَوْمَهُمْ كُلَّ مَا رُدُّوَاْ إِلَى الْفِتْنِةِ أُرْكِسُواْ فِيِهَا فَإِن لَّمْ يَعْتَزِلُوكُمْ وَيُلْقُواْ إِلَيْكُمُ السَّلَمَ وَيَكُفُّوَاْ أَيْدِيَهُمْ فَخُذُوهُمْ وَاقْتُلُوهُمْ حَيْثُ ثِقِفْتُمُوهُمْ وَأُوْلَـئِكُمْ جَعَلْنَا لَكُمْ عَلَيْهِمْ سُلْطَانًا مُّبِينًا

(91) - {You will find others who wish to obtain security from you and [to] obtain security from their people. Every time they are returned to [the influence of] disbelief, they fall back into it. So if they do not withdraw from you or offer you peace or restrain their hands, then seize them and kill them wherever you overtake them. And those - We have made for you against them a clear authorization.}

The talk is about a group from (Ghatafan), they were close to al-Madina, they wanted to be with their people, but they say to the Prophet (saws) that they are with him at the same time. So if they do not withdraw from fighting the Muslims and do not offer the peace, then the Prophet (saws) has the right to seize them and kill them.

( وَأُولَٰئِكُمْ جَعَلْنَا لَكُمْ عَلَيْهِمْ سُلْطَانًا مُّبِينًا ) (…And those – We have made for you against them a clear authorization): The clear authorization means the power, it is either the power of fighting or the power of proof and the power of the religion, this religion of peace the religion, love and safe for all the humans.

The following verse clarifies the danger of killing a human soul: