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
bayhaqi:15979 – Abū Aḥmad ʿAbdullāh b. Muḥammad b. al-Ḥasan al-Mihrajānī > Abū Bakr Muḥammad b. Jaʿfar al-Muzakkī > Muḥammad b. Ibrāhīm al-ʿAbdī > Ibn Bukayr > Mālik > Yaḥyá b. Saʿīd > Marwān b. al-Ḥakam Katab > Muʿāwiyah b. Abū Sufyān > Utī Bimajnūn Qatal a man Fakatab Ilayh Muʿāwiyah

[Machine] That you understand him and do not underestimate him, for he is not lacking in intelligence.  

البيهقي:١٥٩٧٩ – أَخْبَرَنَا أَبُو أَحْمَدَ عَبْدُ اللهِ بْنُ مُحَمَّدِ بْنِ الْحَسَنِ الْمِهْرَجَانِيُّ أنبأ أَبُو بَكْرٍ مُحَمَّدُ بْنُ جَعْفَرٍ الْمُزَكِّي ثنا مُحَمَّدُ بْنُ إِبْرَاهِيمَ الْعَبْدِيُّ ثنا ابْنُ بُكَيْرٍ قَالَ قَالَ مَالِكٌ حَدَّثَنِي يَحْيَى بْنُ سَعِيدٍ أَنَّ مَرْوَانَ بْنَ الْحَكَمِ كَتَبَ إِلَى مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ أَنَّهُ أُتِيَ بِمَجْنُونٍ قَتَلَ رَجُلًا فَكَتَبَ إِلَيْهِ مُعَاوِيَةُ

أَنِ اعْقِلْهُ وَلَا تُقِدْ مِنْهُ فَإِنَّهُ لَيْسَ عَلَى مَجْنُونٍ قَوَدٌ