Mukhtasar Bukhari

Narrated Abu Sa'id (may Allah be pleased with him): We observed I'tikaf with the Prophet (peace and blessings of Allah be upon him) during the middle ten days of Ramadan. Then, on the morning of the twentieth day, he came out and addressed us, saying: "I was shown Laylat al-Qadr in a dream, but I forgot it," or he said, "it was made to be forgotten. So now seek it in the odd nights of the last ten nights. And I saw (in the dream) as if I was prostrating in mud, so whoever has observed I'tikaf with the Messenger of Allah (peace and blessings of Allah be upon him) should observe I'tikaf again (in these last ten nights)." So we all observed I'tikaf, and at that time we did not see any sign of clouds in the sky. Suddenly, a cloud came and it rained until the roof of the mosque, which was made of palm branches, started leaking. Then the prayer was established, and I saw the Messenger of Allah (peace and blessings of Allah be upon him) prostrating in the mud, so much so that I saw the mark of mud on his forehead even after the prayer.