Sura 8 Al-Anfal (The Spoils of War), ayah 56

1. الَّذِينَ عَاهَدْتَ مِنْهُمْ ثُمَّ يَنْقُضُونَ عَهْدَهُمْ فِي كُلِّ مَرَّةٍ وَهُمْ لَا يَتَّقُونَ

   The ones with whom you made a treaty but then they break their pledge every time, and they do not fear Allah.

   8:56

Translation: Saheeh International