Al-Husayn ibn Sa‘id, from Safwan, from Al-‘Ala’, from Muhammad ibn Muslim, said:
I asked Abu Ja‘far, peace be upon him, about a man who prays while in his garment there are coins that have figures on them. Imam عليه السلام said: "There is no problem with that."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 390