Al-Kāfi - Volume 6 > The Manner of Slaughtering and al-Nahr
Hadith #3

عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ وَ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ وَ عَلِيُّ بْنُ مُحَمَّدٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ أَبِي نَصْرٍ عَنْ يُونُسَ بْنِ يَعْقُوبَ قَالَ قُلْتُ لِأَبِي الْحَسَنِ الْأَوَّلِ ( عليه السلام ) إِنَّ أَهْلَ مَكَّةَ لَا يَذْبَحُونَ الْبَقَرَ وَ إِنَّمَا يَنْحَرُونَ فِي اللَّبَّةِ فَمَا تَرَى فِي أَكْلِ لَحْمِهَا قَالَ فَقَالَ ( عليه السلام ) فَذَبَحُوها وَ ما كادُوا يَفْعَلُونَ لَا تَأْكُلْ إِلَّا مَا ذُبِحَ .

3. A number of our people have narrated from Sahl ibn Ziyad and Ali ibn Ibrahim has narrated from his father from and Ali ibn Muhammad from Ahmad ibn Muhammad from ibn abu Nasr from Yunus ibn Ya’qub who has said the following: “I once said to abu al-Hassan, ‘Alayhi al-Salam, that people of Makkah in the case of cows do Nahr (make a cut in the upper part of the chest); so what do you say about using it for food? He (the Imam) said, ‘They slaughtered it but they almost failed to do so thus, you must not eat unless it is slaughtered and it is not killed by means of Nahr.’”