And in another report, she said:

((ما رأيت رسول الله ﷺ يصلي سبحة الضحى قط، وإني لأسبحها)) “I NEVER SAW the Messenger of Allah ﷺ pray the Dhuha prayer at all, though I myself do pray it.” Both reports are found in Sahih Muslim. 5⃣ Some scholars explained that the fact that the Prophet ﷺ did not fast the ten days does not mean that fasting them is not virtuous, because he ﷺ may have had other important matters that prevented him from fasting. 6⃣ Many scholars also mentioned that the Prophet ﷺ would sometimes leave certain good deeds out of concern that people might think those deeds were obligatory upon them. For example, Aishah (may Allah be pleased with her) said: ((مَا رَأَيْتُ رَسُولَ الله ﷺ يُصَلِّي سُبْحَةَ الضُّحَى قَطُّ، وَإِنِّي لَأُسَبِّحُهَا، وَإِنْ كَانَ رَسُولُ الله ﷺ لَيَدَعُ الْعَمَلَ وَهُوَ يُحِبُّ أَنْ يَعْمَلَ بِهِ؛ خَشْيَةَ أَنْ يَعْمَلَ بِهِ النَّاسُ فَيُفْرَضَ عَلَيْهِمْ)) “I never saw the Messenger of Allah ﷺ pray Dhuha prayer, though I do pray it. The Messenger of Allah ﷺ would sometimes leave a deed that he loved to do, out of fear that people would act upon it and it would become obligatory upon them.” [Reported by Bukhari & Muslim] Conclusion: Strive to fast all nine days. Sheikh 'Uthaymeen was asked: “Has it been authentically reported that the Messenger of Allah ﷺ fasted all ten days of Dhul-Hijjah?” He replied: “There is something reported from the Prophet ﷺ that is even stronger than simply him fasting them: he encouraged fasting them by saying: ((ما من أيام العمل الصالح فيهن أحب إلى الله من هذه الأيام العشر، قالوا: ولا الجهاد في سبيل الله؟ قال: ولا الجهاد في سبيل الله؛ إلا رجل خرج بنفسه وماله فلم يرجع من ذلك بشيء)) ‘There are no days in which righteous deeds are more beloved to Allah than these ten days.’ They said: ‘Not even jihad in the path of Allah?’ He replied: ‘Not even jihad in the path of Allah, except for a man who went out with his life and wealth and returned with nothing.’” [Liqa’ Al-Bab Al-Maftuh (92/12)] And Allah knows best https://t.me/madrasatunaa/209