Muwatta Malik #709
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 الرَّحْمَنِ بْنِ الْقَاسِمِ، عَنْ أَبِيهِ، أَنَّهُ كَانَ يَقُولُ مَنْ كَانَ عَلَيْهِ قَضَاءُ رَمَضَانَ فَلَمْ يَقْضِهِ - وَهُوَ قَوِيٌّ عَلَى صِيَامِهِ - حَتَّى جَاءَ رَمَضَانُ آخَرُ فَإِنَّهُ يُطْعِمُ مَكَانَ كُلِّ يَوْمٍ مِسْكِينًا مُدًّا مِنْ حِنْطَةٍ وَعَلَيْهِ مَعَ ذَلِكَ الْقَضَاءُ .
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ عَنْ سَعِيدِ بْنِ جُبَيْرٍ، مِثْلُ ذَلِكَ .
Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasim
that his father used to say, "If someone has to make up for days not
fasted in Ramadan and does not do them before the next Ramadan comes
although he is strong enough to do so, he should feed a poor man with
a mudd of wheat for every day that he has missed, and he has to fast
the days he owes as well."
Yahya related to me from Malik
that he had heard the same thing from Said ibn Jubayr.
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About Muwatta Malik
This hadith is #709 from Muwatta Malik, in the Book of Fasting.