جامع الترمذي

Salim bin 'Abdullah narrated from 'Abdullah bin 'Umar about the dream of the Prophet (s.a.w) and Abu Bakr and 'Umar, so he said: "I saw that the people had gathered, so Abu Bakr drew a bucket or two buckets- in him was some weakness- and Allah forgive him. Then 'Umar stood to draw and the bucket turned into a very large one, and I have never seen a strong man toiling so hard until it was as if the people had gathered at a (camel) watering hole."