Rules about Performing Salah (Prayer) in an Unclean Cloth Regardless One Knows it or Not

16. Al-Husayn ibn Muhammad has narrated from Mu‘alla’ ibn Muhammad, from Muhammad ibn ‘Abd Allah al-Wasitiy, from al-Qasim al-Sayqal who has said the following: “I once wrote to al-Rida’ عليه السلام, saying, ‘I make sword sheathing of leather from dead donkeys. My clothes come in contact with it and I perform Salah (prayer) with them. He (the Imam) عليه السلام, wrote to me, ‘Find other clothes for your Salah (prayer).’ I then wrote to abu Ja’far, the second عليه السلام, saying, ‘I would write to your father عليه السلام, about such and such issues. It became difficult for me and I then began to make them from leather of wild donkeys, properly slaughtered.’ He (the Imam) wrote to me, ‘All good deeds require patience, I pray to Allah to grant you blessings. If what you do is from wild ones and properly slaughtered, then it is not harmful.’”