question #1 Sahih al-Bukhari 1996, Book 30, Hadith 102 : What is the significance of fasting during the days of Mina in Islamic tradition?

Hisham said, “My father said that ‘Aishah (ra) used to observe Saum (fast) on the days of Mina.” His (i.e., Hisham’s) father also used to observe Saum on those days.