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.
tabarani:10845Muḥammad b. Yaḥyá b. Mandah al-Aṣbahānī > ʿAbdullāh b. Dāwud Sandīlah > Ibrāhīm b. Ayyūb al-Firsāny > Abū Hāniʾ Ismāʿīl b. Khalīfah > Maʿmar > Zāʾidah > al-Aʿmash > Abū Ṣāliḥ > Ibn ʿAbbās

[Machine] On the authority of the Prophet, ﷺ , he said: "Whoever hides knowledge that he knows, he will be bridled on the Day of Judgment with a bridle of fire." He said: "It is the testimony that is called for or not called for, and he knows it and does not guide its possessor to it. This is the knowledge."  

الطبراني:١٠٨٤٥حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ مَنْدَةَ الْأَصْبَهَانِيُّ ثنا عَبْدُ اللهِ بْنُ دَاوُدَ سَنْدِيلَةُ ثنا إِبْرَاهِيمُ بْنُ أَيُّوبَ الْفِرْسانيُّ ثنا أَبُو هَانِئٍ إِسْمَاعِيلُ بْنُ خَلِيفَةَ عَنْ مَعْمَرٍ عَنْ زَائِدَةَ عَنِ الْأَعْمَشِ عَنْ أَبِي صَالِحٍ عَنِ ابْنِ عَبَّاسٍ

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ كَتَمَ عِلْمًا يَعْلَمُهُ أُلْجِمَ يَوْمَ الْقِيَامَةِ بِلِجَامٍ مِنْ نَارٍ» قَالَ «هِي الشَّهَادَةُ تَكُونُ عَنِ الرَّجُلِ يُدْعا لَهَا أَوْ لَا يُدْعَا لَهَا وَهُوَ يَعْلَمُهَا وَلَا يُرْشِدُ صَاحِبَهَا إِلَيْهَا فَهُوَ هَذَا الْعِلْمُ»