Ahmad ibn Muhammad from Abu Talib ibn Al-Salt from Al-Qasim ibn Al-Fudayl, who said:
I said to (Imam) Al-Ridha عليه السلام, peace be upon him: “May I be your ransom, a man prostrates upon his sleeve due to the harm of heat or cold.” Imam عليه السلام said: "There is no harm in it."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 330