Sunan Abi Dawud 3658
سنن أبي داود#3658Sahihحَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا عَلِيُّ بْنُ الْحَكَمِ، عَنْ عَطَاءٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ سُئِلَ عَنْ عِلْمٍ فَكَتَمَهُ أَلْجَمَهُ اللَّهُ بِلِجَامٍ مِنْ نَارٍ يَوْمَ الْقِيَامَةِ " .
Narrated AbuHurayrah: The Prophet (ﷺ) said: He who is asked something he knows and conceals it will have a bridle of fire put on him on the Day of Resurrection
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniHasan Sahih
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 26:18