Language:
كتاب الأضاحي
73  
Al-Adha Festival Sacrifice (Adaahi)
(9)
Chapter: Slaughtering the sacrifice with own hands.
(9)
باب مَنْ ذَبَحَ الأَضَاحِيَّ بِيَدِهِ
Sahih al-Bukhari 5558

Narrated Anas:

The Prophet (ﷺ) slaughtered two rams, black and white in color (as sacrifices), and I saw him putting his foot on their sides and mentioning Allah's Name and Takbir (Allahu Akbar). Then he slaughtered them with his own hands.

حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، قَالَ ضَحَّى النَّبِيُّ صلى الله عليه وسلم بِكَبْشَيْنِ أَمْلَحَيْنِ، فَرَأَيْتُهُ وَاضِعًا قَدَمَهُ عَلَى صِفَاحِهِمَا يُسَمِّي وَيُكَبِّرُ، فَذَبَحَهُمَا بِيَدِهِ‏.‏
Reference : Sahih al-Bukhari 5558
In-book reference : Book 73, Hadith 14
USC-MSA web (English) reference : Vol. 7, Book 68, Hadith 465
  (deprecated numbering scheme)