Sahih Bukhari
Sacrifice on Occasion of Birth (Aqiqa)
Volume: 007 / Book Number: 066 / Hadith Number: 382
Narrated 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.