الكافي- ط الاسلامية, volume 3, page 399

8. Ahmad ibn Idris has narrated from Muhammad ibn ‘Abd al-Jabbar from Ali ibn Mahziyar from a man who had has said the following: “He had asked him (the Imam) about performing Salah (prayer) with foxes (things from it) and he (the Imam) prohibited him to perform Salah (prayer) in such things and with the clothes which is the next layer. He (the man) did not know which layer was meant; the one touching the furs or the one touching one’s skin. He (the Imam) wrote with his handwriting that said, ‘It is the one that touches the skin. He (the narrator) has said that he then asked abu al-Hassan that he had asked him (the Imam) about this issue and he (the Imam) had said, ‘Do not perform Salah (prayer) with the clothes which are on its top as well as that which is beneath.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

9. Ali ibn Mahziyar from has said the following: “Ibrahim ibn ‘Uqbah once wrote to him (the Imam) (a.s.), asking, ‘People here make socks and waistbands from the fur of foxes. Is it permissible to perform Salah (prayer) with it without Taqiyah (fear) or necessity? He (the Imam) wrote with his hand writing, ‘It is not permissible to perform Salah (prayer) with it.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

10. Ahmad ibn Idris has narrated from Muhammad ibn ‘Abd al-Jabbar who has said the following: “I once wrote to abu Muhammad (a.s.), asking if it is permissible to perform Salah (prayer) with a cap of pure silk or silk brocade. He (the Imam) wrote, ‘It is not lawful to perform Salah (prayer) with pure silk.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

11. Ali ibn Muhammad has narrated from ‘Abd Allah ibn Ishaq al-‘Alaviy from al-Hassan ibn Ali from Muhammad ibn Sulayman al- Daylamiy from Furayt from ibn abu Ya‘fur who has said the following: “Once I was in the presence of abu ‘Abd Allah (a.s.), when a man of al-Khazzazin came and said, ‘I pray to Allah to keep my soul in service for your cause, ‘What do you say about performing Salah (prayer) with al-Khazz? He (the Imam) said, ‘It is not an offense to perform Salah (prayer) with it.’ A man then said to him (the Imam), ‘I pray to Allah to keep my soul in service for your cause, it is dead and it is manufactured and I know it. Abu ‘Abd Allah (a.s.), said, ‘I know it more than you do.’ The man said, ‘It is manufactured and no one knows more than I know.’ Abu ‘Abd Allah (a.s.), then smiled and asked, ‘Do you say that it is an animal that comes from water? Or you say that it is caught from water and is brought out and when it is away from water it dies?’ The man said, ‘You spoke the truth, I pray to Allah to keep my soul in service for your cause, that is how it is.’ Abu ‘Abd Allah (a.s.), said to him, ‘So you say that it is an animal that walks on four feet and it is not like whales in the case of which its properly being slaughtered is its coming out of the water.’ The man said, ‘Yes, by Allah that is what I say how it is.’ Abu ‘Abd Allah (a.s.), said, ‘Allah, most High has made it lawful and its proper slaughtering is its dying like whales for which proper slaughtering is its dying.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.