Muwatta Malik #666
Fasting
Yahya related to me from Malik from Yahya ibn Said that Atika
bint Zayd ibn Amr ibn Nufayl, the wife of Umar ibn al-Khattab, used to
kiss Umar ibn al-Khattab's head while he was fasting, and he did not
tell her not to.
About Muwatta Malik
This hadith is #666 from Muwatta Malik, in the Book of Fasting. Muwatta Malik contains 1,985 hadiths across 61 books.