ENOfficial
Abu Huraira reported God’s messenger as saying, “He who is asked about something he knows and conceals it will have a bridle of fire put on him on the day of resurrection.” Ahmad, Abu Dawud and Tirmidhi transmitted it, and Ibn Majah transmitted it from Anas.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «من سُئِلَ عَنْ عِلْمٍ عَلِمَهُ ثُمَّ كَتَمَهُ أُلْجِمَ يَوْمَ الْقِيَامَةِ بِلِجَامٍ مِنْ نَارٍ» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُد وَالتِّرْمِذِيّ وَرَوَاهُ ابْن مَاجَه عَن أنس
sunnah.com