At-Taubah 34. O you who believe! Many among the rabbis and monks do indeed consume the wealth of people in legally invalid, wrongful ways (such as changing the Book’s commandments in return for worldly benefit, bribery, and using religion as a means of worldly gain) and bar them from God’s way. Those who hoard up gold and silver and do not spend it in God’s cause (to exalt His cause and help the poor and needy): give them (O Messenger) the glad tidings of a painful punishment.
At-Taubah 35. On that day, it (that hoarded wealth) will be heated in the fire of Hell and, therewith, their foreheads and their sides and their backs will be branded (and they will hear): “This is the treasure which you hoarded up for yourselves; taste now what you were busy hoarding!”