As for what was narrated by Muhammad bin Ali bin Mahbub, from Ahmad, from Musa bin Al-Qasim and Abu Qatadah, from Ali bin Ja’far, from his brother Imam Musa Al-Khadim عليه السلام: I asked Imam عليه السلام about a man whose garment comes into contact with a dead donkey - can he pray in it before washing it? Imam عليه السلام said: "He is not required to wash it, and he may pray in it. There is no harm."