Musnad Ahmad 1153:933

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, from al-Hakam, from Ibrahim, that ‘Alqamah and Shurayh ibn Arta’ah were with ‘Aishah. One of them said: "Ask her about kissing for the fasting person." One of them said: "I will not speak obscenely in the presence of the Mother of the Believers." She said: "The Messenger of Allah, peace and blessings of Allah be upon him, used to kiss while he was fasting, and he used to touch [his wives] while he was fasting, and he was the most capable among you of controlling his desire."