Mishkat al-Masabih #2009
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 إِذَا أَرَادَ أَنْ يَعْتَكِفَ صَلَّى الْفَجْرَ ثُمَّ دَخَلَ فِي مُعْتَكَفِهِ. رَوَاهُ أَبُو دَاوُدَ وَابْنُ مَاجَهْ
‘A'isha said that when God’s messenger intended to engage in private devotion in the mosque he prayed the dawn prayer and then entered his place of seclusion.
Abu Dawud and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #2009 from Mishkat al-Masabih, in the Book of Fasting.