he would devote himself more (in the worship of Allah) in the last ten nights of Ramadan than he strove in earlier part of the month.

'Aishah (May Allah be pleased with her) reported:

The Messenger of Allah (ﷺ) used to strive more in worship during Ramadan than he strove in any other time of the year; and he would devote himself more (in the worship of Allah) in the last ten nights of Ramadan than he strove in earlier part of the month.

[Muslim].

وعنها قالت‏:‏ كان رسول الله صلى الله عليه وسلم ، يجتهد في رمضان ما لا يجتهد في غيره، وفي العشر الأواخر منه، ما لا يجتهد في غيره‏"‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏

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