Mishkat al-Masabih #1241
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن معَاذَة قَالَتْ: سَأَلْتُ عَائِشَةَ: كَمْ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي صَلَاةَ الضُّحَى؟ قَالَتْ: أَرْبَعَ رَكَعَاتٍ وَيَزِيدُ مَا شَاءَ اللَّهُ. رَوَاهُ مُسلم
Mu'adha said she asked ‘A’isha how many rak'as God’s Messenger prayed at the forenoon prayer, and she replied, “Four rak'as, but sometimes more, as God pleased.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1241 from Mishkat al-Masabih, in the Book of Prayer.