Al-Kāfi - Volume 6 > The Case of the Tails of Sheep Cut off into two and the Animal Hunted
Hadith #2

مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ عَلِيِّ بْنِ أَبِي حَمْزَةَ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) أَنَّهُ قَالَ فِي أَلَيَاتِ الضَّأْنِ تُقْطَعُ وَ هِيَ أَحْيَاءٌ إِنَّهَا مَيْتَةٌ .

2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Ali ibn abu Hamzah from abu Basir who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ’If the tails of sheep are cut off when the sheep is alive, the tail is dead like being slaughtered improperly.’”