English translation
2016. Narrated Abū Salama: I asked Abū Sa'īd رضي الله عنه - and he was a friend of mine - (about the night of Qadr) and he said, "We practised I'tikāf (seclusion in the mosque) in the middle third of the month of Ramaḍān with the Prophet ﷺ. In the morning of the 20th of Ramaḍān, the Prophet ﷺ came and addressed us and said, 'I was informed of (the date of the night of Qadr) but I was caused to forget it (or I forgot); so, search for it in the odd nights of the last ten nights of the month of Ramaḍān. (In the dream) I saw myself prostrating in mud and water (as a sign). So, whoever was in I'tikāf with me should return to it (for another 10 days period)', and we returned. At that time there was no sign of clouds in the sky, but suddenly a cloud came and it rained till rain-water started leaking through the roof of the mosque which was made of date-palm leaf stalks. Then the Ṣalāt (prayer) was established and I saw Allāh's Messenger ﷺ prostrating in mud and water and I saw the traces of mud on his forehead."