Mukhtasar Muslim

Narrated Ibn Abbas (may Allah be pleased with them) that the Messenger of Allah (peace and blessings of Allah be upon him) traveled during Ramadan and observed the fast until he reached the place of Usfan. Then he (peace be upon him) asked for a bowl, in which there was something to drink, and he (peace be upon him) drank it during the day so that everyone could see. He continued to break the fast until he reached Mecca. Ibn Abbas (may Allah be pleased with them) says that the Messenger of Allah (peace and blessings of Allah be upon him) both observed the fast and broke it, so whoever wishes may fast and whoever wishes may break the fast.