Chapter on What is Permissible to Pray in, from Clothing and Place, and What is Not Permissible to Pray in, from That

Muhammad ibn Ahmad ibn Yahya, from Umar ibn Ali ibn Umar ibn Yazid, from Ibrahim ibn Muhammad al-Hamadhani, who said: I wrote to Him عليه السلام: "Fur and hair from animals whose meat is not lawful to eat fall onto my garment, without any taqiyyah or necessity, what is the ruling?" He عليه السلام wrote in reply: "Prayer in it is not permissible."