(2) باب فِي لَيْلَةِ الْقَدْرِ
Narrated Ibn 'Abbas:
The Prophet (ﷺ) as saying: Seek laitat al-Qadr in the last ten night of Ramadan. When nine (nights) remain (i.e. on the twenty first) , when seven (night) remain (i.e. on the twenty third), and when five (nights) remain (i.e. on the twenty fifth).
Reference: Sunan Abi Dawud 1381
In-book reference: Book 6, Hadith 11
English translation: Book 6, Hadith 1376