Musannaf Ibn Abi Shayba 27:363

Affan narrated to us, he said: Hammad ibn Salamah narrated to us, he said: Al-Ash'ath ibn Abd al-Rahman al-Jarmi informed us, from his father, from Samurah ibn Jundub, that a man said: "O Messenger of Allah, I saw as if a bucket was lowered from the sky. Then Abu Bakr came and took hold of its two handles and drank, and there was weakness in his drinking. Then Umar came and took hold of its two handles and drank until he was satiated. Then Uthman came and took hold of its two handles and drank until he was satiated."