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
tabarani:8923 – Abū Khalīfah > Muḥammad b. Kathīr > Sufyān > al-Aʿmash > Abū Wāʾil > ʿAbdullāh

[Machine] "Verily, the one who gives people fatwas on everything they seek his guidance in is insane."  

الطبراني:٨٩٢٣ – حَدَّثَنَا أَبُو خَلِيفَةَ ثنا مُحَمَّدُ بْنُ كَثِيرٍ ثنا سُفْيَانُ عَنِ الْأَعْمَشِ عَنْ أَبِي وَائِلٍ عَنْ عَبْدِ اللهِ قَالَ

«إِنَّ الَّذِي يُفْتِي النَّاسَ فِي كُلِّ مَا يَسْتَفْتُونَهُ فِيهِ مَجْنُونٌ»  

See similar narrations below:

Collected by Dārimī
darimi:176 – Muḥammad b. Yūsuf > Sufyān > al-Aʿmash > Abū Wāʾil > Ibn Masʿūd

[Machine] "The one who gives fatwas to people in all matters that are asked is insane."  

الدارمي:١٧٦ – أَخْبَرَنَا مُحَمَّدُ بْنُ يُوسُفَ عَنْ سُفْيَانَ عَنِ الْأَعْمَشِ عَنْ أَبِي وَائِلٍ عَنِ ابْنِ مَسْعُودٍ قَالَ

«إِنَّ الَّذِي يُفْتِي النَّاسَ فِي كُلِّ مَا يُسْتَفْتَى لَمَجْنُونٌ»