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:2042 – ʿAbdullāh from my father > Hushaym > Mujālid > al-Shaʿbī > Masrūq

[Machine] "If any of you reaches the age of forty, let him take caution and be mindful of Allah, glorified be He."  

الزهد لأحمد:٢٠٤٢ – حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنِي أَبِي حَدَّثَنَا هُشَيْمٌ عَنْ مُجَالِدٍ عَنِ الشَّعْبِيِّ عَنْ مَسْرُوقٍ قَالَ

«إِذَا بَلَغَ أَحَدُكُمْ أَرْبَعِينَ سَنَةً فَلْيَأْخُذْ حِذْرَهُ مِنَ اللَّهِ سُبْحَانَه»