Good Manners and Form (Al-Adab) 
Bukhari :: Book 8 :: Volume 73 :: Hadith 193
Narrated Ibn 'Abbas:
Allah's Apostle said to Ibn Saiyad "I have hidden something for you in my mind; What is it?" He said, "Ad-Dukh." The Prophet said, "Ikhsa."
Good Manners and Form (Al-Adab)
Bukhari :: Book 8 :: Volume 73 :: Hadith 193
Narrated Ibn 'Abbas:
Allah's Apostle said to Ibn Saiyad "I have hidden something for you in my mind; What is it?" He said, "Ad-Dukh." The Prophet said, "Ikhsa."