Musnad Ahmad 27:1408

'Affan narrated to us, Sakhr—meaning Ibn Juwayriyah—narrated to us, from Nafi', from Ibn 'Umar, that the Messenger of Allah (ﷺ) said: "While I was at a well, drawing from it, Abu Bakr and 'Umar came. Abu Bakr took the bucket and drew a bucketful or two, and there was weakness in his drawing—may Allah forgive him. Then 'Umar ibn al-Khattab took it from Abu Bakr, and it transformed in his hand into a large bucket. I have never seen a genius among the people performing such a feat, until the people watered their camels and rested them."