Mishkat al-Masabih #1995
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَجْتَهِدُ فِي الْعَشْرِ الْأَوَاخِرِ مَا لَا يَجْتَهِدُ فِي غَيره. رَوَاهُ مُسلم
‘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.
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About Mishkat al-Masabih
This hadith is #1995 from Mishkat al-Masabih, in the Book of Fasting.