He who is asked something he knows and conceals it will have a bridle of fire put on him on the Day of Resurrection. [Ahmed]
مَنْ سُئِلَ عن عِلْمٍ فَكَتَمَهُ، أُلْجِمَ يوم القيامةِ بِلِجَامٍ مِنْ نارٍ (رواه احمد)
