مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2354
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that 'Abdullah bin 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) set out in the year of the conquest in Ramadan. He fasted Ramadan and the Muslims fasted with him until, when he was in al-Kadeed, he called for a vessel of water. He was on his mount, and he drank whilst the people were looking on, to show them that he had broken the fast, and the Muslims broke the fast.
Musnad Ahmad 2363A saheeh hadeeth; this is a hasan isnad]