Salim (may Allah have mercy on him) narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both), and Urwah (may Allah have mercy on him) from Sayyidah Aishah (may Allah be pleased with her), that they both said: "Fasting during the days of Tashriq was not permitted except for one who could not find a sacrificial animal."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8465
Sayyidah Aishah (may Allah be pleased with her) narrates: The fasting of one performing Hajj al-Tamattu' is from when he enters the state of ihram for Hajj until the Day of Arafah. If he misses them, he should fast during the days of Mina.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8467
Urwah narrates from Sayyidah Aishah (may Allah be pleased with her) that she said concerning the one performing Hajj al-Tamattu': when he does not find a sacrificial animal and has not fasted before Arafah, then he should fast during the days of Mina.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8469
With the same chain, Ibn Shihab (may Allah have mercy on him) narrated a similar report from Salim (may Allah have mercy on him), and he from his father (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8470