From Sahih Bukhari (Hadith 2057):
Narrated `Aisha:Some people said, "O Allah's Messenger (ﷺ)! Meat is brought to us by some people and we are not sure whether the name of Allah has been mentioned on it or not (at the time of slaughtering the animals)." Allah's Messenger (ﷺ) said (to them), "Mention the name of Allah and eat it
Reference: Bukhari 2057