Abdullah bin Samit says that once he was with Hazrat Abu Dharr (may Allah be pleased with him) when his stipend arrived. He had a slave girl with him who began to arrange his necessities with that money. She had seven coins left. Hazrat Abu Dharr (may Allah be pleased with him) ordered her to exchange his money (to get change). I said to him, "If you had saved this money, it could have been useful in some need or when a guest arrived." He replied, "My beloved Prophet (peace and blessings be upon him) advised me that any gold or silver that is sealed and kept is a spark of fire for its owner until he spends it in the way of Allah."