´Narrated Abu Hurairah:` that the Messenger of Allah (ﷺ) said: "Whoever is asked about some knowledge that he knows, then he conceals it, he will be bridled with bridle of fire."
Hadith ReferenceSunan at-Tirmidhi / Chapters on Knowledge / Hadith: 2649
Hadith Gradingالألبانی:صحيح، ابن ماجة (264)
Hadith Takhrij«سنن ابی داود/ العلم 9 (3658) ، سنن ابن ماجہ/المقدمة 24 (261) ( تحفة الأشراف : 14196) (صحیح)»