اقرأ وتدبر الآية 1312 من سورة سُورَةُ التَّوۡبَةِ: فَأَعْقَبَهُمْ نِفَاقًا فِي قُلُوبِهِمْ إِلَىٰ يَوْمِ يَلْقَوْنَهُ بِمَا أَخْلَفُوا اللَّهَ مَا وَعَدُوهُ وَبِمَا كَانُوا يَكْذِبُونَ
فَأَعْقَبَهُمْ نِفَاقًا فِي قُلُوبِهِمْ إِلَىٰ يَوْمِ يَلْقَوْنَهُ بِمَا أَخْلَفُوا اللَّهَ مَا وَعَدُوهُ وَبِمَا كَانُوا يَكْذِبُونَ
whereupon He causes hypocrisy to take root in their hearts, [therein to remain] until the Day on which they shall meet Him" - because they have failed to fulfil the vow which they had made unto God, and because they were wont to lie.