Musannaf Ibn Abi Shayba 4:376

Abdullah ibn Numayr narrated to us, he said: Muhammad ibn Ishaq narrated to us, from Yazid ibn Abi Habib, from Marthad ibn Abdullah al-Yazani, from Hudhayfah al-Azdi, from Junadah al-Azdi, who said: I entered upon the Messenger of Allah (may Allah bless him and grant him peace) with seven men from Azd, I being the eighth of them, on a Friday, and we were fasting. The Messenger of Allah (may Allah bless him and grant him peace) invited us to food that was before him. We said: "We are fasting." He said: "Did you fast yesterday?" We said: "No." He said: "Will you fast tomorrow?" We said: "No." He said: "Then break your fast." Then he went out to the Friday prayer. When he sat on the pulpit, he called for a vessel of water and drank from it while the people were looking at him, so that he might teach them that he does not fast on Friday.