رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1192
The Book of Virtues
The Superiority of Lailat-ul-Qadr (the Night of Decree)
وعنها، رَضِيَ اللَّه عَنْهَا، أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: تَحَرَّوْا لَيْلَةَ الْقَدْرِ فِي الْوِتْرِ مِنَ الْعَشْرِ الْأَوَاخِرِ من رَمَضَان ((رَوَاهُ البُخَارِيّ)).
'Aishah (May Allah be pleased with her) reported: The Messenger of Allah (ﷺ) used to observe I'tikaf in the last ten days of Ramadan and say, "Seek Lailat-ul-Qadr (Night of Decree) in the odd nights out of the last ten nights of Ramadan." [Al- Bukhari].
Riyad as-Salihin, 1192