At Tawbah, 12 Ayah
9:12
وَإِن نَّكَثُوٓاْ أَيۡمَٰنَهُم مِّنۢ بَعۡدِ عَهۡدِهِمۡ وَطَعَنُواْ فِي دِينِكُمۡ فَقَٰتِلُوٓاْ أَئِمَّةَ ٱلۡكُفۡرِ إِنَّهُمۡ لَآ أَيۡمَٰنَ لَهُمۡ لَعَلَّهُمۡ يَنتَهُونَ ١٢
Wa 'In Nakathū 'Aymānahum Min Ba`di `Ahdihim Wa Ţa`anū Fī Dīnikum Faqātilū 'A'immata Al-Kufri ۙ 'Innahum Lā 'Aymāna Lahum La`allahum Yantahūna
And if they break their oaths after their treaty and defame your religion, then fight the leaders of disbelief, for indeed, there are no oaths [sacred] to them; [fight them that] they might cease.