Yahya related to me from Malik from Hisham ibn Urwa from hisfather that A'isha, umm al-muminin, may Allah be pleased with her,said, "The Messenger of Allah, may Allah bless him and grant himpeace, used to kiss certain of his wives when fasting," and then shelaughed.
USC-MSA web (English) reference: Book 18, Hadith 14
Arabic reference: Book 18, Hadith 647