Quran 9:12 from Surah At-Tawba on Divine Marvels.
وَإِن نَّكَثُوٓاْ أَيۡمَٰنَهُم مِّنۢ بَعۡدِ عَهۡدِهِمۡ وَطَعَنُواْ فِي دِينِكُمۡ فَقَٰتِلُوٓاْ أَئِمَّةَ ٱلۡكُفۡرِ إِنَّهُمۡ لَآ أَيۡمَٰنَ لَهُمۡ لَعَلَّهُمۡ يَنتَهُونَ
English translation: And if they break their oaths after after their treaty and defame [in] your religion then fight the leaders (of) [the] disbelief indeed, they no oaths for them so that they may cease
Transliteration: wa-in nakathu aymanahum min ba'di ahdihim wata'anu fi dinikum faqatilu a-immata al-kuf'ri innahum la aymana lahum la'allahum yantahuna