Muwatta Malik #702
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 نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ كَانَ يَقُولُ مَنِ اسْتَقَاءَ وَهُوَ صَائِمٌ فَعَلَيْهِ الْقَضَاءُ وَمَنْ ذَرَعَهُ الْقَىْءُ فَلَيْسَ عَلَيْهِ الْقَضَاءُ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to say, "If some one makes himself vomit while he is fasting he
has to make up a day, but if he cannot help vomiting he does not have
to make up anything."
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About Muwatta Malik
This hadith is #702 from Muwatta Malik, in the Book of Fasting.