“Abu ’Abd Allah (a.s.), has said, ‘If a man covers himself with a loincloth up to his two breast he can perform Salah (prayer) with it. He (the narrator) has said that he read in the letter of Muhammad ibn Ibrahim to abu al-Hassan (a.s.), in which he had asked about fennec if it is permissible to perform Salah (prayer) with it. He (the Imam) had written, ‘It is not an offense to perform Salah (prayer) with it.’ He had written asking about the skins of foxes and he (the Imam) had written, ‘It is undesirable.’ He had written asking about lining of silk (not the one from silkworm) if performing Salah (prayer) with it is permissible. He (the Imam) had written, ‘It is permissible.’”