صحيح مسلم بالإنكليزيةBook 6: The Book of Fasting (Kitab Al-Sawm) › Chapter 40: ONE SHOULD EXERT MORE (IN DEVOTION AND PRAYER) IN THE LAST TEN DAYS OF RAMADAN
'A'isha (Allah be pleased with her) reported that Allah's Messenger (may peace be upon him) used to exert himself in devotion during the last ten nights to a greater extent than at any other time.