Musnad Abu Ya'la al-Mawsili 210:20

Abu Khaythama narrated to us, Jarir narrated to us, from Mansur, from Muslim ibn Sabih, from Shutayr ibn Shakl, from Hafsa bint Umar, who said: The Messenger of Allah (peace and blessings of Allah be upon him) used to kiss while he was fasting.