Abu Dawud Book 4, Hadith Number 1752.

Narated By Abdullah ibn Umar : Umar ibn al-Khattab named a bukhti camel for sacrifice (at hajj). He was offered three hundred dinars for it (as its price). He came to the Prophet (PBUH) and said: Apostle of Allah, I named a bukhti camel for sacrifice and I was offered for it three hundred dinars. May I sell it and purchase another one for its price? No, sacrifice it.