Sahih Muslim
The Book of Fasting (Kitab Al-Sawm)
Book Number: 006 / Hadith Number: 2437
Sufyan reported: I said to 'Abd al-Rahman b. Qasim: Have you heard from your father narrating from 'A'isha (Allah be pleased with her) that he kissed her while observing fast? He ('Abd al-Rahman b. Qasim) kept silence for a short while and then said:" Yes."