Musnad Ahmad 10082

He who is asked something he knows and conceals it will have a bridle of fire put on him on the Day of Resurrection

Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) 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."

"‏من سئل عن علم فكتمه ألجم يوم القيامة بلجام من نار‏"

Narrated by Abu Hurayrah + 10 other versions Explained

The Prophet said: "There is no man who memorizes knowledge then conceals it, but he will be brought forth on the Day of Resurrection bridled with reins of fire." (Hasan) Another chain with similar wording.

"‏ مَا مِنْ رَجُلٍ يَحْفَظُ عِلْمًا فَيَكْتُمُهُ إِلاَّ أُتِيَ بِهِ يَوْمَ الْقِيَامَةِ مُلْجَمًا بِلِجَامٍ مِنَ النَّارِ ‏"

Narrated by Abu Hurayrah

'I heard Anas bin Malik say: "I heard the Messenger of Allah say: "Whoever is asked about knowledge and conceals it, it will be bridled on the Day of Resurrection with reins of fire.'"

"‏ مَنْ سُئِلَ عَنْ عِلْمٍ فَكَتَمَهُ أُلْجِمَ يَوْمَ الْقِيَامَةِ بِلِجَامٍ مِنْ نَارٍ ‏"

Narrated by Anas ibn Mālik

"The Messenger of Allah said: 'Whoever conceals knowledge which Allah has made beneficial for mankind's affairs of religion, Allah will bridle him with reins of fire on the Day of Resurrection."

"‏ مَنْ كَتَمَ عِلْمًا مِمَّا يَنْفَعُ اللَّهُ بِهِ فِي أَمْرِ النَّاسِ فِي الدِّينِ أَلْجَمَهُ اللَّهُ يَوْمَ الْقِيَامَةِ بِلِجَامٍ مِنَ النَّارِ ‏"

Narrated by Abu Sa‘īd al-Khudri