Muwatta Malik #652
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ
" الشَّهْرُ تِسْعٌ وَعِشْرُونَ فَلاَ تَصُومُوا حَتَّى تَرَوُا الْهِلاَلَ وَلاَ تُفْطِرُوا حَتَّى تَرَوْهُ فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ " .
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.