by Imam Muslim, translation by Abdul Hamid Siddiqui , Volume: The Book of Sacrifices (Kitab Al-Adahi)
Chapter: IT IS MERITORIOUS TO SACRIFICE THE ANIMAL WITH ONE'S OWN HAND AND SO IS MERITORIOUS THE RECITATION OF BISMILLAH (IN THE NAME OF ALLAH) AND TAKBIR (ALLAH-O-AKBAR)
Anas reported that Allah's Messenger (may peace be upon him) sacrificed with his own hands two horned rams which were white with black markings reciting the name of Allah and glorifying Him (saying Allah-o-Akbar). He placed his foot on their sides (while sacrificing).
Anas reported that Allah's Messenger (may peace be upon him) sacrificed two horned rams of white colour with black markings over them. He also stated: I saw him sacrificing them with his own hand and saw him placing his foot on their sides, and recited the name of Allah and Glorified Him.
Shu'ba reported: Qatada informed me that he had heard Anas saying that Allah's Messenger (may peace be npon him) sacrificed (the horned rams) and like that. I said: Did you (Qatada) hear from Anas? He said. Yes.
This hadith has been transmitted on the authority of Anas with a slight variation of wording.
'A'isha reported that Allah's Messenger (may peace be upon him) commanded that a ram with black legs, black belly and black (circles) round the eyes should be brought to him, so that he should sacrifice it. He said to 'A'isha: Give me the large knife, and then said: Sharpen it on a stone. She did that. He then took it (the knife) and then the ram; he placed it on the ground and then sacrificed it, saying: Bismillah, Allah-humma Taqabbal min Muhammadin wa Al-i-Muhammadin, wa min Ummati Muhammadin (In the name of Allah," O Allah, accept [this sacrifice] on behalf of Muhammad and the family of Muhammad and the Umma of Muhammad" ).