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 Muhammad ibn Abdul-Jabbar, who said: I wrote to Abu Muhammad عليه السلام, peace be upon him, asking: "Is it permissible to pray in a cap that has upon it the fur of an animal whose meat is not permissible to eat, or in a waistband of silk, or in a waistband made from rabbit fur?" Imam عليه السلام wrote: "Prayer is not permissible in pure silk. And if the fur is from a properly slaughtered animal (dhakiyyah), then prayer in it is permissible, Allah سبحانه وتعالى willing."