Musannaf Ibn Abi Shayba 23:196

Abu Usama narrated to us, from ‘Amr ibn Hamza, he said: Salim informed me, from Ibn ‘Umar, he said: ‘Umar said: I saw the Messenger of Allah (peace and blessings of Allah be upon him) in a dream, and I saw him not looking at me. I said: "O Messenger of Allah, what is the matter with me?" He said: "Are you not the one who kisses while you are fasting?" I said: "By the One who sent you with the truth, I will not kiss again while I am fasting."