Hadith 4:321
Hafs narrated to us, from Hajjaj, from Abu Ishaq, from al-Harith, from Ali, who said: If vomiting overcomes him, then there is no making up (the fast) upon him. And if he induces vomiting, then making up (the fast) is upon him.
حدثنا حفص عن حجاج عن أبي إسحاق عن الحارث عن علي قال إذا ذرعه القيء فليس عليه القضاء وإذا استقاء فعليه القضاء