It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) and Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "Whoever fasts the (three) days during Hajj and does not find a sacrificial animal (hady) when he performs tamattu', then this (time for the fasts) is from when one of you enters ihram until the Day of Arafah, and that is the last of them."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13165