Messenger of Allah, I saw in a dream as though a bucket was lowered down from the sky. Abu Bakr came and took hold of its handles and drank a small amount. Then Umar came and took hold of its handles and drank until he was fully satisfied. Then Uthman came and took hold of its handles and drank until he was fully satisfied. Then Ali came and took hold of its handles, but it slipped away, and some of its water splashed onto him.
حدثنا محمد بن المثنى قال حدثني عفان بن مسلم حدثنا حماد بن سلمة عن أشعث بن عبد الرحمن عن أبيه
يا رسول الله إني رأيت كأن دلوا دلي من السماء فجاء أبو بكر فأخذ بعراقيها فشرب شربا ضعيفا ثم جاء عمر فأخذ بعراقيها فشرب حتى تضلع ثم جاء عثمان فأخذ بعراقيها فشرب حتى تضلع ثم جاء علي فأخذ بعراقيها فانتشطت وانتضح عليه منها شيء
[Its isnad is hasan] Ahmad narrated it (21:5) from the hadith of Hammad bin Salama, with this same chain.Abdul-Rahman Abu Ashath was deemed trustworthy by Ibn Hibban and by Haythami (Majma al-Zawaid, 7:180). It is stated in Tahrir Taqrib Tahdheeb (4050) that he is trustworthy, and Ibn Main also deemed him trustworthy.