Holding Fast to the Qur'an and Sunnah
Bukhari :: Book 9 :: Volume 92 :: Hadith 398
Narrated Anas bin Malik:
A man said, "O Allah's Prophet! Who is my father?" The Prophet said, "Your father is so-and-so." And then the Divine Verse:-- 'O you who believe! Ask not questions about things..(5.101)