Muhammad ibn Ya‘qub, from Muhammad ibn Yahya, from Ahmad ibn Muhammad, from Hammad, from Hariz, from a man, from Abu Ja‘far عليه السلام, peace be upon him, who said: I said to Him عليه السلام regarding the verse: ‘So pray to your Lord and sacrifice”’ (Surah Kawthar 108:2). He عليه السلام said: “The ‘nahr’ (sacrifice) is uprightness in standing, that one straightens his back and his neck.” And Imam عليه السلام said: “Do not place your hands on your hips (takfir), for that is what the Magians do. Do not cover your mouth (talath-thum), do not squat (ihtifaz), do not sit on your feet (iq‘aʾ), and do not spread your forearms on the ground.”