Musnad Ahmad 32:329

Rawh ibn ‘Ubadah narrated to us, Hisham ibn Hassan narrated to us, from Humayd al-Tawil, from Anas ibn Malik: "The Prophet, peace and blessings of Allah be upon him, was on a journey during Ramadan, and a vessel was brought to him, so he placed it upon his hand." When the people saw him, they broke their fast.