Hazrat Sa'd bin Abi Waqqas narrated that the Prophet Muhammad (peace be upon him) said: The greatest sinner among the Muslims is the one who asked about something that was not forbidden, and because of his question, it was made forbidden.
Hadith Referenceاللؤلؤ والمرجان / كتاب الفضائل / 1521
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 96 كتاب الاعتصام: 3 باب ما يكره من كثرة السؤال وتكلف ما لا يعنيه»