Surah At-Tawba Verse 12

وَإِن نَّكَثُوا أَيْمَانَهُم مِّن بَعْدِ عَهْدِهِمْ وَطَعَنُوا فِي دِينِكُمْ فَقَاتِلُوا أَئِمَّةَ الْكُفْرِ ۙ إِنَّهُمْ لَا أَيْمَانَ لَهُمْ لَعَلَّهُمْ يَنتَهُونَ

Wa in nakasooo aimaanahum mim ba'di 'ahdihim wa ta'anoo fee deenikum faqaatilooo a'immatal kufri innahum laaa aimaana lahum la'allahum yantahoon

Translation / The Meaning

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.