Sahifah Hammam ibn Munabbih

And the Messenger of Allah, peace and blessings be upon him, said: "The example of the miser and the one who gives charity is like two persons who are wearing two iron coats of mail or two armors, which reach up to their chests or collarbones. When the one who gives charity gives something in charity, it moves away from his body, and it covers his fingers, and (while walking) the mark of his feet disappears. And whenever the miser spends something or even intends in his heart to spend, every ring of that coat or armor tightens in its place. The miser tries to loosen it, but he cannot loosen it."