Sayyidah Aishah (may Allah be pleased with her) said: Fasting is for the one who performs tamattu' Hajj and does not find a sacrificial animal, from the time he says the talbiyah for Hajj until the Day of Arafah; and whoever could not fast in those days should fast during the days of Mina.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8898