Sahih Bukhari Volume 008, Book 073, Hadith Number 010.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 73. Good Manners and Form (Al-Adab)
Narated By Abu Sufyan : That Heraclius sent for him and said, "What did he, i.e. the Prophet order you?" I replied, "He orders us to offer prayers; to give alms; to be chaste; and to keep good relations with our relatives.