Sahih al-Bukhari 2016

Muʿādh ibn Faḍālah related to us: Hishām related to us, from Yaḥyā, from Abū Salamah, who said: I asked Abū Saʿīd, who was a friend of mine. He said: We observed iʿtikāf with the Prophet (Allah bless him and grant him peace) during the middle ten days of Ramaḍān. On the morning of the twentieth, he came out, addressed us, and said: ‘I was shown the Night of Decree, then I was made to forget it—or I forgot it. So seek it during the odd nights of the last ten days. I saw myself prostrating in water and mud. Whoever has been observing iʿtikāf with the Messenger of Allah, let him return.’ We returned, and saw no clouds in the sky. Then a cloud came and it rained until water streamed through the mosque roof, which was made of palm fronds. The prayer was called, and I saw the Messenger of Allah prostrating in water and mud, until I saw traces of mud on his forehead.’