وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تَحَرَّوْا لَيْلَةَ الْقَدْرِ فِي الْوِتْرِ مِنَ الْعَشْرِ الْأَوَاخِرِ من رَمَضَان» . رَوَاهُ البُخَارِيّ

‘A'isha said that God’s messenger used to exert himself in devotion during the last ten nights to a greater extent than at any other time.Muslim transmitted it.