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:16289 – Abū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās al-Aṣam > Baḥr b. Naṣr > ʿAbdullāh b. Wahb > al-Layth > Ayyūb b. Mūsá al-Qurashī > Makḥūl

[Machine] That Umar ibn Abdul Aziz wrote to the armies in every region, stating that for every piece of straw cut from a finger's width, a third of the finger's intellect is lost.  

البيهقي:١٦٢٨٩ – أَخْبَرَنَا أَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو ثنا أَبُو الْعَبَّاسِ الْأَصَمُّ ثنا بَحْرُ بْنُ نَصْرٍ ثنا عَبْدُ اللهِ بْنُ وَهْبٍ أَخْبَرَنِي اللَّيْثُ عَنْ أَيُّوبَ بْنِ مُوسَى الْقُرَشِيِّ عَنْ مَكْحُولٍ

أَنَّ عُمَرَ بْنَ عَبْدِ الْعَزِيزِ كَتَبَ إِلَى الْأَجْنَادِ فِي كُلِّ قَصَبَةٍ قُطِعَتْ مِنْ قَصَبِ الْأَصَابِعِ ثُلُثُ عَقْلِ الْإِصْبَعِ