The words of Allah: "O you who believe! Take care of your own selves." Sunan Ibn Majah 4015

Arabic hadith text
حَدَّثَنَا الْعَبَّاسُ بْنُ الْوَلِيدِ الدِّمَشْقِيُّ، حَدَّثَنَا زَيْدُ بْنُ يَحْيَى بْنِ عُبَيْدٍ الْخُزَاعِيُّ، حَدَّثَنَا الْهَيْثَمُ بْنُ حُمَيْدٍ، حَدَّثَنَا أَبُو مُعَيْدٍ، حَفْصُ بْنُ غَيْلاَنَ الرُّعَيْنِيُّ عَنْ مَكْحُولٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قِيلَ يَا رَسُولَ اللَّهِ مَتَى نَتْرُكُ الأَمْرَ بِالْمَعْرُوفِ وَالنَّهْىَ عَنِ الْمُنْكَرِ قَالَ ‏"‏ إِذَا ظَهَرَ فِيكُمْ مَا ظَهَرَ فِي الأُمَمِ قَبْلَكُمْ ‏"‏ ‏.‏ قُلْنَا يَا رَسُولَ اللَّهِ وَمَا ظَهَرَ فِي الأُمَمِ قَبْلَنَا قَالَ ‏"‏ الْمُلْكُ فِي صِغَارِكُمْ وَالْفَاحِشَةُ فِي كِبَارِكُمْ وَالْعِلْمُ فِي رُذَالَتِكُمْ ‏"‏ ‏.‏ قَالَ زَيْدٌ تَفْسِيرُ مَعْنَى قَوْلِ النَّبِيِّ ـ صلى الله عليه وسلم ـ ‏"‏ وَالْعِلْمُ فِي رُذَالَتِكُمْ ‏"‏ ‏.‏ إِذَا كَانَ الْعِلْمُ فِي الْفُسَّاقِ
Translation
It was narrated that Anas bin Malik said

“It was said: ‘OMessengerof Allah, when should we stop enjoining what is good andforbiddingwhat is evil?’ He said: ‘When there appears among youthat whichappeared among those who came before you.’ We said: ‘OMessenger ofAllah, what appeared among those that came before us?’He said:‘Kingship given to your youth, immorality even among theold, andknowledge among the base and vile.’”