(14) باب التَّكْبِيرِ عِنْدَ الذَّبْحِ
Narrated Anas:
The Prophet (ﷺ) offered as sacrifices, two horned rams, black and white in color. He slaughtered them with his own hands and mentioned Allah's Name over them and said Takbir and put his foot on their sides.
Reference: Sahih al-Bukhari 5565
In-book reference: Book 73, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 68, Hadith 472