Musnad Abu Ya'la al-Mawsili 153:100

Muhammad ibn Abdullah ibn Numayr narrated to us, Muhammad ibn Bishr narrated to us, Ubaydullah narrated to us, from Abu Bakr ibn Salim, from Salim, from Abdullah ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "I was shown in a dream that I was drawing water with a bucket from a well. Then Abu Bakr came and drew a bucketful or two, and he drew it with some weakness, and may Allah forgive him. Then Umar came and drew water, and it transformed into a large bucket, and I have not seen a genius among the people who could perform his feat, until the people drank their fill and watered their camels."