Al-Kāfi - Volume 6 > The Manner of Slaughtering and al-Nahr
Hadith #1

عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ قَالَ قَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) النَّحْرُ فِي اللَّبَّةِ وَ الذَّبْحُ فِي الْحَلْقِ .

1. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Mu‘awiyah ibn ‘Ammar who has said the following: “Abu ‘ Abd Allah, ‘Alayhi al-Salam, has said, ’For al-Nahr the cut must be made in the upper part of the chest and in slaughtering the throat must be cut.’”