Muwatta Malik #652
Fasting
Yahya related to me from Malik from Abdullah ibn Dinar from
Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and
grant him peace, said, "A month has twenty-nine days in it. Do not
start the fast or break it until you see the new moon. 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 #652 from Muwatta Malik, in the Book of Fasting. Muwatta Malik contains 1,985 hadiths across 61 books.