Sura al-Baqara 2:74

ثُمَّ قَسَتْ قُلُوبُكُم مِّنۢ بَعْدِ ذَٰلِكَ فَهِىَ كَٱلْحِجَارَةِ أَوْ أَشَدُّ قَسْوَةً وَإِنَّ مِنَ ٱلْحِجَارَةِ لَمَا يَتَفَجَّرُ مِنْهُ ٱلْأَنْهَٰرُ وَإِنَّ مِنْهَا لَمَا يَشَّقَّقُ فَيَخْرُجُ مِنْهُ ٱلْمَآءُ وَإِنَّ مِنْهَا لَمَا يَهْبِطُ مِنْ خَشْيَةِ ٱللَّـهِ وَمَا ٱللَّـهُ بِغَٰفِلٍ عَمَّا تَعْمَلُونَ

thumma qasat qulūbukum min baʿdi dhālika fahiya ka-l-ḥijārati aw ashaddu qaswatan wa-inna mina l-ḥijārati lamā yatafajjaru minhu l-anhāru wa-inna minhā lamā yashshaqqaqu fa-yakhruju minhu l-māʾu wa-inna minhā lamā yahbiṭu min khashyati allāhi wa-mā allāhu bi-ghāfilin ʿammā taʿmalūna

Thenceforth were your hearts hardened: They became like a rock and even worse in hardness. For among rocks there are some from which rivers gush forth; others there are which when split asunder send forth water; and others which sink for fear of Allah. And Allah is not unmindful of what ye do.