And from him, from Muhammad ibn Ibrahim, who said:
I wrote to Him عليه السلام asking about prayer in the skins of rabbits. Imam عليه السلام wrote in reply: "It is makrooh (disliked)."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 218