Sahih Bukhari Volume 008, Book 073, Hadith Number 032.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 73. Good Manners and Form (Al-Adab)
Narated By Usama bin Zaid : Allah's Apostle used to put me on (one of) his thighs and put Al-Hasan bin 'Ali on his other thigh, and then embrace us and say, "O Allah! Please be Merciful to them, as I am merciful to them."