Muwatta Malik #651
Fasting
Yahya related to me from Malik from Nafi from Abdullah ibn Umar
that the Messenger of Allah, may Allah bless him and grant him peace,
once mentioned Ramadan and said, "Do not begin the fast until you see
the new moon, and do not break the fast (at the end of Ramadan) until
you see it. If the new moon is obscured from you, then work out (when
it should be)."
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About Muwatta Malik
This hadith is #651 from Muwatta Malik, in the Book of Fasting. Muwatta Malik contains 1,985 hadiths across 61 books.