Muwatta Malik, Book 24, Hadith 1045 (In-Book) ⓘ

Yahya related to me from Malik from Hisham ibn Urwa that his father said, "The Messenger of Allah, may Allah bless him and grant him peace, was asked, 'Messenger of Allah! Some people from the desert bring us meat, and we do not know whether the name of Allah has been mentioned over it or not.' The Messenger of Allah, may Allah bless him and grant him peace, said, 'Mention the name of Allah over it and eat.' " Malik said, "That was in the beginning of Islam."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ قَالَ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقِيلَ لَهُ يَا رَسُولَ اللَّهِ إِنَّ نَاسًا مِنْ أَهْلِ الْبَادِيَةِ يَأْتُونَنَا بِلُحْمَانٍ وَلاَ نَدْرِي هَلْ سَمَّوُا اللَّهَ عَلَيْهَا أَمْ لاَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ سَمُّوا اللَّهَ عَلَيْهَا ثُمَّ كُلُوهَا ‏" ‏ ‏.‏ قَالَ مَالِكٌ وَذَلِكَ فِي أَوَّلِ الإِسْلاَمِ ‏.‏