Narrated Anas bin Malik:
that a man said: "O Messenger of Allah! Who is my father?" He said: "Your father is so-and-so." He said: "So (the following) was revealed: O you who believe! Ask not about things which, if made plain to you, may cause you trouble (5:101)." (DE)
English reference (DE): Vol. 5, Book 44, Hadith 3056 (DE)
Arabic reference (DE): Book 47, Hadith 3333 (DE)