Sahih Bukhari
Al-Adha Festival Sacrifice (Adaahi)
Volume: 007 / Book Number: 068 / Hadith Number: 472
Narrated Anas:
The Prophet 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.