Sahih Bukhari
Sahih Bukhari Volume 008, Book 073, Hadith Number 026.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 73. Good Manners and Form (Al-Adab)
Narated By Abu Huraira : Allah's Apostle kissed Al-Hasan bin Ali while Al-Aqra' bin Habis At-Tamim was sitting beside him. Al-Aqra said, "I have ten children and I have never kissed anyone of them," Allah's Apostle cast a look at him and said, "Whoever is not merciful to others will not be treated mercifully."