Musnad Ahmad 1153:2301

Ya'qub and Sa'd narrated to us, they said: My father narrated to us, from his father, from Talhah ibn 'Abdullah ibn 'Uthman, he said: Sa'd al-Taymi said: I heard 'Aishah saying: The Messenger of Allah, peace and blessings of Allah be upon him, wanted to kiss me, and I said: "I am fasting." He said: "And I am fasting." Then he kissed me.