Sahih Bukhari Volume 009, Book 093, Hadith Number 495.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 93. Oneness, Uniqueness of Allah (Tawheed)
Narrated By 'Aisha : The people said to the Prophet , "O Allah's Apostle! Here are people who have recently embraced Islam and they bring meat, and we do not know whether they had mentioned Allah's Name while slaughtering the animals or not." The Prophet said, "You should mention Allah's Name and eat."