Musnad Abu Ya'la al-Mawsili 109:209

Narrated to us Abd al-A’la, narrated to us Hammad, from Sa’id al-Jurayri, from Abu Nadra, from Jabir: That the Prophet (peace be upon him) was on a journey during Ramadan, and he and his companions came upon a pool of water. He said to the people, "Drink." They said, "We drink, but you do not drink?" He said, "I am the easiest of you; I am a rider." So he dismounted and drank, and they drank.