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."