Muwatta Malik
Book 18, Hadith 47
Arabic hadith text
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 .
Translation
Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to say, "If some one makes himself vomit while he is fasting hehas to make up a day, but if he cannot help vomiting he does not haveto make up anything."