I was shown Lailat-ul-Qadr; then some members of my family awoke me up, then I was caused to forget it. So seek it in the last week. Harmala said: (The Prophet did not say:" I was made to forget," but he stated):" But I forgot it."
Sahih Muslim Book 13, Hadith 274
← Previous Hadith Seek the time of Lailat-ul-Qadr in the last (ten nights), or he said: in the last nine (nights).

Sahih Muslim Book 13, Hadith 273 Next Hadith → I used to devote myself (observe i'tikaf) during these ten (nights). Then I started devoting myself in the last ten (nights). And he who desires to observe i'tikaf along with me should spend the night) at his place of i'tikaf. And I saw this night (Lailat-ul-Qadr) but I forgot it (the exact night) ; so seek it;In the last ten nights on odd numbers. I saw (the glimpses of that dream) that I was prostrating in water and mud. Abu Sa'id al-Khudri said: It rained on the twenty-first night and the water dripped (from the roof) of the mosque at the place where the Messenger of Allah (ﷺ) observed prayer. I looked at him and as he completed the dawn prayer, (I found) his face was wet with mud and water.

Sahih Muslim Book 13, Hadith 275