Sura al-Nisāʾ 4:90

إِلَّا ٱلَّذِينَ يَصِلُونَ إِلَىٰ قَوْمٍۭ بَيْنَكُمْ وَبَيْنَهُم مِّيثَٰقٌ أَوْ جَآءُوكُمْ حَصِرَتْ صُدُورُهُمْ أَن يُقَٰتِلُوكُمْ أَوْ يُقَٰتِلُوا۟ قَوْمَهُمْ وَلَوْ شَآءَ ٱللَّـهُ لَسَلَّطَهُمْ عَلَيْكُمْ فَلَقَٰتَلُوكُمْ فَإِنِ ٱعْتَزَلُوكُمْ فَلَمْ يُقَٰتِلُوكُمْ وَأَلْقَوْا۟ إِلَيْكُمُ ٱلسَّلَمَ فَمَا جَعَلَ ٱللَّـهُ لَكُمْ عَلَيْهِمْ سَبِيلًا

illā lladhīna yaṣilūna ilā qawmin baynakum wa-baynahum mīthāqun aw jāʾūkum ḥaṣirat ṣudūruhum an yuqātilūkum aw yuqātilū qawmahum wa-law shāʾa allāhu la-sallaṭahum ʿalaykum fa-la-qātalūkum fa-ini iʿtazalūkum fa-lam yuqātilūkum wa-alqaw ilaykumu l-salama fa-mā jaʿala allāhu la-kum ʿalayhim sabīlan

Except those who join a group between whom and you there is a treaty (of peace), or those who approach you with hearts restraining them from fighting you as well as fighting their own people. If Allah had pleased, He could have given them power over you, and they would have fought you: Therefore if they withdraw from you but fight you not, and (instead) send you (Guarantees of) peace, then Allah Hath opened no way for you (to war against them).