Musnad Ahmad 701:2

Yunus ibn Muhammad narrated to us, al-Attaf narrated to us, Mujammi ibn Yaqub narrated to me, from a youth from the people of Quba, that he reached him as an old man, who said: The Messenger of Allah, peace and blessings of Allah be upon him, came to us in Quba, and he sat in the courtyard of the enclosure. People gathered around him, and the Messenger of Allah, peace and blessings of Allah be upon him, asked for water to drink, so he was given water, and he drank. I was on his right, and I was speaking to the people. He handed [the vessel] to me, and I drank. And I remembered that he led us in prayer that day, and he was wearing two sandals, which he did not remove.