The Book of Prayer
Bulugh al-Maram #473
كتاب الصلاة
وَلَهُ عَنْهَا: «مَا رَأَيْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -يُصَلِّي سُبْحَةَ اَلضُّحَى قَطُّ, وَإِنِّي لَأُسَبِّحُهَا»
In yet another narration of Muslim from her:
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"
said, "I have never seen Allah's Messenger (ﷺ) offering Duha prayer, yet I offer it."
— Bulugh al-Maram, Hadith 473