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
suyuti:23a –
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السيوطي:٢٣a –

"آفةُ العِلمِ النِّسْيَانُ، وإِضَاعَتُهُ أَنْ تُحدِّثَ بِه غَيْرَ أهْلِهِ .  

[ش] ابن أبى شيبة والعسكرى في الأمثال، وابن عبد البر في العلم عن الأعمش مرفوعًا معضلا

See similar narrations below:

Collected by Dārimī
darimi:648 – ʿAbdullāh b. Saʿīd > Abū Usāmah > al-Aʿmash

[Machine] The Messenger of Allah ﷺ said, "The harm of knowledge is forgetfulness and its loss is when it is conveyed to someone other than its people."  

الدارمي:٦٤٨ – أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ حَدَّثَنَا أَبُو أُسَامَةَ عَنِ الْأَعْمَشِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «آفَةُ الْعِلْمِ النِّسْيَانُ وَإِضَاعَتُهُ أَنْ تُحَدِّثَ بِهِ غَيْرَ أَهْلِهِ»