It is narrated by Abu Hurayrah (ra) in Sahih al-Bukhari that he once heard the Messenger (saw) say, “When I was sleeping I saw a dream that I was at the edge of a well and there was a bucket, and I kept on pulling from the bucket as long as Allah wanted. Then Ibn Abi Quhafah (Abu Bakr) took it and he pulled it one or two times, and there was some weakness in his pulling, and Allah will forgive him for that weakness.”
This is a prediction from our beloved Prophet (saw). The weakness in pulling was signified by the civil war in the ummah and the wars of apostasy where false imposters claimed prophethood during Abu Bakr’s (ra) reign as khalifah. These conflicts nearly tore the ummah apart.
The narration continues from the Prophet (saw),
“Then it became a massive container and Umar Ibn al-Khattab took that huge bucket, and I never saw such an amazing person do the pulling like the pulling of Umar, and he kept on pulling until even the camel’s pens drank.”
This is the prediction of the conquests of Umar (ra) which expanded the Muslim ummah.