The Quran

ثُمَّ قَسَت قُلوبُكُم مِن بَعدِ ذٰلِكَ فَهِيَ كَالحِجارَةِ أَو أَشَدُّ قَسوَةً ۚ وَإِنَّ مِنَ الحِجارَةِ لَما يَتَفَجَّرُ مِنهُ الأَنهارُ ۚ وَإِنَّ مِنها لَما يَشَّقَّقُ فَيَخرُجُ مِنهُ الماءُ ۚ وَإِنَّ مِنها لَما يَهبِطُ مِن خَشيَةِ اللَّهِ ۗ وَمَا اللَّهُ بِغافِلٍ عَمّا تَعمَلونَ

Muhammad Asad

And yet, after all this, your hearts hardened and became like rocks, or even harder: for, behold, there are rocks from which streams gush forth; and, behold, there are some from which, when they are cleft, water issues; and, behold, there are some that fall down for awe of God¹. And God is not unmindful of what you do!

For an explanation of this allusion, see 7:143. The simile of "the rocks from which streams gush forth" or "from which water issues" serves to illustrate its opposite, namely, dryness and lack of life, and is thus an allusion to the spiritual barrenness with which the Qur'an charges the children of Israel.