كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 394
In yet another narration of Muslim from her:
['Aishah (RA)] said, "I have never seen Allah's Messenger (ﷺ) offering Duha prayer, yet I offer it."
وَلَهُ عَنْهَا: { مَا رَأَيْتُ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-يُصَلِّي سُبْحَةَ اَلضُّحَى قَطُّ, وَإِنِّي لَأُسَبِّحُهَا } 1‏ .‏
Reference : Bulugh al-Maram 394
In-book reference : Book 2, Hadith 394
English translation : Book 2, Hadith 389
Hadith Text
Reference