Quran 2:88 from Surah Al-Baqara on Divine Marvels.
وَقَالُواْ قُلُوبُنَا غُلۡفُۢۚ بَل لَّعَنَهُمُ ٱللَّهُ بِكُفۡرِهِمۡ فَقَلِيلٗا مَّا يُؤۡمِنُونَ
English translation: And they said Our hearts (are) wrapped Nay has cursed them Allah for their disbelief so little (is) what they believe
Transliteration: waqalu qulubuna ghul'fun bal la'anahumu al-lahu bikuf'rihim faqalilan ma yu'minuna