Language:
كتاب الأضاحي
73  
Al-Adha Festival Sacrifice (Adaahi)
(13)
Chapter: To put one's foot on the side of the animal at the time of slaughtering
(13)
باب وَضْعِ الْقَدَمِ عَلَى صَفْحِ الذَّبِيحَةِ
Sahih al-Bukhari 5564

Narrated Anas:

The Prophet (ﷺ) used to offer as sacrifices, two horned rams, black and white in color, and used to put his foot on their sides and slaughter them with his own hands.

حَدَّثَنَا حَجَّاجُ بْنُ مِنْهَالٍ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، حَدَّثَنَا أَنَسٌ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُضَحِّي بِكَبْشَيْنِ أَمْلَحَيْنِ أَقْرَنَيْنِ، وَوَضَعَ رِجْلَهُ عَلَى صَفْحَتِهِمَا، وَيَذْبَحُهُمَا بِيَدِهِ‏.‏
Reference : Sahih al-Bukhari 5564
In-book reference : Book 73, Hadith 20
USC-MSA web (English) reference : Vol. 7, Book 68, Hadith 471
  (deprecated numbering scheme)