﴿ أَوَكُلَّمَا عَٰهَدُوا۟ عَهْدًۭا نَّبَذَهُۥ فَرِيقٌۭ مِّنْهُم ۚ بَلْ أَكْثَرُهُمْ لَا يُؤْمِنُونَ ﴾

“Is it not so that every time they made a promise [unto God], some of them cast it aside? Nay, indeed: most of them do not believe.”

Please check ayah 2:103 for complete tafsir.