Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad-zuhd:1129 – ʿAbdullāh

[Machine] Indeed, people have lost their greatest religion, which is vigilance.  

الزهد لأحمد:١١٢٩ – حَدَّثَنَا عَبْدُ اللَّهِ قَالَ وَجَدْتُ فِي كِتَابِ أَبِي بِخَطِّ يَدِهِ حَدَّثَنِي هَاشِمُ بْنُ الْقَاسِمِ أَبُو النَّضْرِ أَنْبَأَنَا أَبُو عُقَيْلٍ يَعْنِي الثَّقَفِيَّ عَنْ عَبْدِ اللَّهِ بْنِ عُقَيْلٍ عَنِ ابْنِ أَبِي خَالِدٍ يَعْنِي إِسْمَاعِيلَ عَنْ أَبِي السَّفَرِ عَنْ عَائِشَةَ رَحِمَهَا اللَّهُ قَالَتْ

إِنَّ النَّاسَ قَدْ ضَيَّعُوا أَعْظَمَ دِينِهِمْ الْوَرَعَ