ABUDAWUD 3658:
from Abū Hurayrah —
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.
أبو داود ٣٦٥٨:
عن ابو هريره —
قَالَ رَسُولُ اللَّهِ ﷺ مَنْ سُئِلَ عَنْ عِلْمٍ فَكَتَمَهُ أَلْجَمَهُ اللَّهُ بِلِجَامٍ مِنْ نَارٍ يَوْمَ الْقِيَامَةِ