Bukhari

Narrated Yahya: 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.

Narrated `Aisha and Ibn `Umar: Nobody was allowed to fast on the days of Tashriq except those who could not afford the Hadi (Sacrifice).

Narrated `Aisha and Ibn `Umar: Nobody was allowed to fast on the days of Tashriq except those who could not afford the Hadi (Sacrifice).

Narrated Ibn `Umar: Fasting for those who perform ,Hajj-at-Tamattu` (in lieu of the Hadi which they cannot afford) may be performed up to the day of `Arafat. And if one does not get a Hadi and has not fasted (before the `Id) then one should fast of the days of Mina. (11, 12 and 13th of Dhul Hajja).