'Urwah bin Az-Subair narrated from 'Aishah, that:
The Messenger of Allah kissed one of his women (i.e., wives), then he went to perform the prayer, and he did not perform ablution. I ('Urwah bin Zubair) said: "That was not anyone but you,' and she smiled."
English reference: Vol. 1, Book 1, Hadith 502
Arabic reference: Book 1, Hadith 541