Yahya related to me from Malik that he had heard that A'isha, the wife of the Prophet, may Allah bless him and grant him peace, would say, when she mentioned that the Messenger of Allah, used to kiss while fasting, "And who among you is more able to control himself than the Messenger of Allah, may Allah bless him and grant him peace?"
USC-MSA web (English) reference: Book 18, Hadith 18
Arabic reference: Book 18, Hadith 651