The Messenger of Allah (sallallahu alayhi wa sallam) used to pray four Rakat in Duha prayer and increase (the number of Rakat) as much as Allah willed..
وَعَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا
قَالَتْ: «كَانَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي اَلضُّحَى أَرْبَعًا، وَيَزِيدُ مَا شَاءَ اَللَّهُ»
The Messenger of Allah (sallallahu alayhi wa sallam) used to pray four Rakat in Duha prayer and increase (the number of Rakat) as much as Allah willed..
صحيح. رواه مسلم (719) (79)
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The same words, in another collection.
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