Mukhtasar Sahih Al-Bukhari

Allâh's Messenger (ﷺ) went out in the middle of the night and offered (prayer) in the mosque and some men offered (prayer) behind him. This Hadith is repeated. (Please see Nos. 423 and 424). So Allâh's Messenger (ﷺ) died and the situation remained like that [i.e. people offered (prayer) individually]. [3:229-O.B]

Some men amongst the companions of the Prophet (ﷺ) were shown in their dreams that the night of Qadr was in the last seven nights of Ramaḍân. Allâh's Messenger (ﷺ) said, "It seems that all your dreams agree that (the Night of Qadr) is in the last seven nights, and whoever wants to search for it (i.e. the Night of Qadr) should search in the last seven (nights of Ramaḍân). [3:232-O.B]

I asked Abu Sa'îd (about the Night of Qadr) and he said, "We practised I'tikaf (seclusion in the mosque) in the middle third of the month of Ramadân with the Prophet (ﷺ). In the morning of the 20th of Ramaḍân, 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 Ramaḍân. (In the dream) I saw myself prostrating in mud and water (as a sign). So, whoever was in I'tikaf with me (Allâh's Messenger ﷺ) should return to it with me (for another 10 day's period) ', and we returned. At that time there was 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 (prayer) was established and I saw Allâh's Messenger (ﷺ) prostrating in mud and water and I saw the traces of mud on his forehead." [3:233-O.B]

The Prophet (ﷺ) said, "Look for the Night of Qadr in the last ten nights of Ramaḍân on the night when nine or seven or five nights remain out of the last ten nights of Ramaḍân [(i.e. 21, 23, 25, (27, 29,) respectively]." [3:238-0.B]

(Narrated Ibn 'Abbâs) in this quotation: Allâh's Messenger (ﷺ) said, ("The Night of Qadr) is in the last ten nights of the month (Ramaḍân), either on the first nine or in the last (remaining) seven nights (of Ramaḍân)." [3:239-O.B]

Narrated Äisha the start of the last ten days of Ramaḍân, the Prophet (ﷺ) used to tighten his waist-belt (i.e. work hard) and used to offer (prayer) all the night, and used to keep his family awake for the Salât (prayers). [3:241-O.B]