Muwatta Malik #653
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 ثَوْرِ بْنِ زَيْدٍ الدِّيلِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم ذَكَرَ رَمَضَانَ فَقَالَ
" لاَ تَصُومُوا حَتَّى تَرَوُا الْهِلاَلَ وَلاَ تُفْطِرُوا حَتَّى تَرَوْهُ فَإِنْ غُمَّ عَلَيْكُمْ فَأَكْمِلُوا الْعِدَّةَ ثَلاَثِينَ " .
Yahya related to me from Malik from Thawr ibn Zayd ad-Dili from
Abdullah ibn Abbas that the Messenger of Allah, may Allah bless him
and grant him peace, once mentioned Ramadan and said, "Do not start
the fast or break it until you see the new moon. If the new moon is
obscured from you, then complete a full thirty days."
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About Muwatta Malik
This hadith is #653 from Muwatta Malik, in the Book of Fasting.