Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The man who hoards wealth will be branded, and no dirham will touch another dirham, nor any dinar another dinar; his skin will be expanded so much that every dinar and dirham will be placed separately."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8722