the Messenger of Allah ﷺ said, “If any man, who Allah has give knowledge to, and he conceals it, Allah with restrain him on the Day of Judgement with restraints made from fire.”
قَالَ رَسُولُ اللهِ ﷺ «أَيُّمَا رَجُلٌ آتَاهُ اللهُ عِلْمًا فَكَتَمَهُ أَلْجَمَهُ اللهُ يَوْمَ الْقِيَامَةِ بِلِجَامٍ مِنْ نَارٍ»