Hadith 4:337
Ibn Fudayl narrated to us, from Mutarrif, who said: 'Amir was asked about the fasting person who vomits. He said: "If the vomiting overcomes him suddenly, then he does not have to make up the day. But if he vomited intentionally, then he has broken his fast."
حدثنا بن فضيل عن مطرف قال سئل عامر عن الصائم يقيء ( ( ( يقيؤ ) ) ) قال إذا فجأه القيء فلا يقضي وإن كان تقيأ عمدا فقد أفطر