Quran 2:100 from Surah Al-Baqara on Divine Marvels.
أَوَكُلَّمَا عَٰهَدُواْ عَهۡدٗا نَّبَذَهُۥ فَرِيقٞ مِّنۡهُمۚ بَلۡ أَكۡثَرُهُمۡ لَا يُؤۡمِنُونَ
English translation: And is (it not that) whenever they took a covenant threw it away a party of them Nay most of them (do) not believe
Transliteration: awakullama ahadu ahdan nabadhahu fariqun min'hum bal aktharuhum la yu'minuna