Musannaf Ibn Abi Shayba 5:896

Ibn Fudayl narrated to us, from al-A’mash, from ‘Abdullah ibn Murrah, from Masruq, from ‘Abdullah, who said: By the One besides whom there is no god, Allah will not punish a man for a treasure that he hoards, such that a dirham touches a dirham, or a dinar touches a dinar. Rather, his skin will be expanded until every dirham and every dinar is placed separately.