Musnad Ahmad 1301:20

'Abd al-Samad narrated to us, he said: My father narrated to us, he said: al-Husayn narrated to us, from Yahya ibn Abi Kathir, he said: 'Abd al-Rahman ibn 'Amr al-Awza'i narrated to me, from Ya'ish ibn al-Walid ibn Hisham, that he narrated to him that his father narrated to him, he said: Ma'dan ibn Abi Talha narrated to me, that Abu al-Darda' informed him that the Messenger of Allah (may Allah bless him and grant him peace) vomited and broke his fast. He said: So I met Thawban, the freed slave of the Messenger of Allah (may Allah bless him and grant him peace), in the mosque of Damascus, and I said: "Indeed, Abu al-Darda' informed me that the Messenger of Allah (may Allah bless him and grant him peace) vomited and broke his fast." He said: "He spoke the truth; I poured his water for ablution."