Language:
كتاب العقيقة
71  
Sacrifice on Occasion of Birth (`Aqiqa)
(4)
Chapter: Al-‘Atira
(4)
باب الْعَتِيرَةِ
Sahih al-Bukhari 5474

Narrated Abu Huraira:

The Prophet (ﷺ) said, "Neither Fara' nor 'Atira) is permissible)." Al-Fara' was the first offspring (they got of camels or sheep) which they (pagans) used to offer (as a sacrifice) to their idols. 'Atira was (a sheep which used to be slaughtered) during the month of Rajab.

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ الزُّهْرِيُّ حَدَّثَنَا عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ لاَ فَرَعَ وَلاَ عَتِيرَةَ ‏"‏‏.‏ قَالَ وَالْفَرَعَ أَوَّلُ نِتَاجٍ كَانَ يُنْتَجُ لَهُمْ، كَانُوا يَذْبَحُونَهُ لِطَوَاغِيتِهِمْ، وَالْعَتِيرَةُ فِي رَجَبٍ‏.‏
Reference : Sahih al-Bukhari 5474
In-book reference : Book 71, Hadith 9
USC-MSA web (English) reference : Vol. 7, Book 66, Hadith 383
  (deprecated numbering scheme)