Al-Kāfi - Volume 6 > Tools for Slaughtering
Hadith #3

مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ سَيْفِ بْنِ عَمِيرَةَ عَنْ أَبِي بَكْرٍ الْحَضْرَمِيِّ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) أَنَّهُ قَالَ لَا يُؤْكَلُ مَا لَمْ يُذْبَحْ بِحَدِيدَةٍ .

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Sayf ibn ‘Amirah from abu Bakr al- Hadramiy who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘Animals that are not slaughtered with iron cannot be used for food.’”