Sahih Bukhari Volume 007, Book 066, Hadith Number 382.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 66. Sacrifice on Occasion of Birth (Aqiqah)
Narrated By Abu Huraira : The Prophet said, "Neither Fara' nor 'Atira (is permissible):" Al-Fara' nor 'Atira (is permissible):" Al-Fara' was the first offspring (of camels or sheep) which the pagans used to offer (as a sacrifice) to their idols. And Al-'Atira was (a sheep which was to be slaughtered) during the month of Rajab.