Part of a lengthy Hadīth: قَالَ حُذَيْفَةُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " تُعْرَضُ الْفِتَنُ عَلَى الْقُلُوبِ كَالْحَصِيرِ عُودًا عُودًا فَأَىُّ قَلْبٍ أُشْرِبَهَا نُكِتَ فِيهِ نُكْتَةٌ سَوْدَاءُ وَأَىُّ قَلْبٍ أَنْكَرَهَا نُكِتَ فِيهِ نُكْتَةٌ بَيْضَاءُ حَتَّى تَصِيرَ عَلَى قَلْبَيْنِ عَلَى أَبْيَضَ مِثْلِ الصَّفَا فَلاَ تَضُرُّهُ فِتْنَةٌ مَا دَامَتِ السَّمَوَاتُ وَالأَرْضُ وَالآخَرُ أَسْوَدُ مُرْبَادًّا كَالْكُوزِ مُجَخِّيًا لاَ يَعْرِفُ مَعْرُوفًا وَلاَ يُنْكِرُ مُنْكَرًا إِلاَّ مَا أُشْرِبَ مِنْ هَوَاهُ " . Hudhayfah reported: The Messenger of Allah, (May Allāh make mention of him in the highest assembly of angels and grant him peace), said, “Tribulation will be exposed to the hearts of people like a reed mat woven, stick by stick. Any heart afflicted by them will have a black mark put into it, but any heart that rejects them will have a white mark put into it. Thus, there will be two kinds of hearts: one is pure like a white gemstone; it will not be harmed by any trial as long as the heavens and earth endure. The other is black and dusty like a worn-out vessel, neither acknowledging good nor rejecting evil, rather absorbed in its desires.” Sahīh Muslim 144 a