ثُمَّ قَسَتْ قُلُوْبُكُمْ مِّنْۢ بَعْدِ ذٰلِكَ فَهِيَ كَالْحِجَارَةِ اَوْ اَشَدُّ قَسْوَةً ۗ وَاِنَّ مِنَ الْحِجَارَةِ لَمَا يَتَفَجَّرُ مِنْهُ الْاَنْهٰرُ ۗ وَاِنَّ مِنْهَا لَمَا يَشَّقَّقُ فَيَخْرُجُ مِنْهُ الْمَاۤءُ ۗوَاِنَّ مِنْهَا لَمَا يَهْبِطُ مِنْ خَشْيَةِ اللّٰهِ ۗوَمَا اللّٰهُ بِغَافِلٍ عَمَّا تَعْمَلُوْنَ ( البقرة: ٧٤ )
Summa qasat quloobukum mim ba'di zaalika fahiya kalhijaarati aw-ashaadu qaswah; wa inna minal hijaarati lamaa yatafajjaru minhul anhaar; wa inna minhaa lamaa yash shaqqaqu fayakhruju minhul maaa'; wa inna minhaa lamaa yahbitu min khashyatil laa; wa mal laahu bighaafilin 'ammaa ta'maloon (al-Baq̈arah 2:74)
Then your hearts became hardened after that, being like stones or even harder. For indeed, there are stones from which rivers burst forth, and there are some of them that split open and water comes out, and there are some of them that fall down for fear of Allah. And Allah is not unaware of what you do. (Al-Baqarah  : 74)
1 Mufti Taqi Usmani
When, even after that, your hearts were hardened, as if they were rocks, or still worse in hardness. For surely among the rocks there are some from which rivers gush forth, and there are others that crack open and water flows from them, and there are still others that fall down in fear of Allah. And Allah is not unaware of what you do.