Sahih Bukhari Volume 6, Book 60, Hadith Number 146.

Narrated By Ibn Abbas : Some people were asking Allah’s Apostle questions mockingly. A man would say, “Who is my father?” Another man whose she-camel had gone astray would say, “Where is my she-camel? “So Allah revealed this Verse in this connection: “O you who believe! Ask not about things which, if made plain to you, may cause you trouble.” (5.101)