An-Nisa 4:91

سَتَجِدُونَ ءَاخَرِينَ يُرِيدُونَ أَن يَأۡمَنُوكُمۡ وَيَأۡمَنُواْ قَوۡمَهُمۡ كُلَّ مَا رُدُّوٓاْ إِلَى ٱلۡفِتۡنَةِ أُرۡكِسُواْ فِيهَاۚ فَإِن لَّمۡ يَعۡتَزِلُوكُمۡ وَيُلۡقُوٓاْ إِلَيۡكُمُ ٱلسَّلَمَ وَيَكُفُّوٓاْ أَيۡدِيَهُمۡ فَخُذُوهُمۡ وَٱقۡتُلُوهُمۡ حَيۡثُ ثَقِفۡتُمُوهُمۡۚ وَأُوْلَـٰٓئِكُمۡ جَعَلۡنَا لَكُمۡ عَلَيۡهِمۡ سُلۡطَٰنٗا مُّبِينٗا 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