Musnad Ahmad 1156:62

'Abd al-Rahman ibn Mahdi narrated to us, he said: Musa—meaning Ibn 'Ali—narrated to us, from his father, from Abu Qays, who said: 'Abdullah ibn 'Amr sent me to Umm Salamah to ask her: "Did the Messenger of Allah (may Allah bless him and grant him peace) kiss while he was fasting?" And he said: "If she says 'No,' then say to her: 'Indeed, 'Aishah informs the people that the Messenger of Allah (may Allah bless him and grant him peace) used to kiss while he was fasting.'" He said: So I asked her, "Did the Messenger of Allah (may Allah bless him and grant him peace) kiss while he was fasting?" She said: "No." I said: "Indeed, 'Aishah informs the people that the Messenger of Allah (may Allah bless him and grant him peace) used to kiss while he was fasting." She said: "Perhaps it was her that he could not restrain himself from out of love, but as for me, he did not."