Ibn Hibban

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "The example of the miser and the one who gives charity is like two men wearing two iron coats of armor or two iron breastplates, which cover them from their chests up to their necks. Whenever the charitable person gives charity and intends to do so, the armor moves away from his skin, until it covers the marks of his feet and comes down to the tips of his toes (i.e., it falls down). But whenever the miser intends to spend something and thinks about it, the armor becomes tighter and each ring of it gets fixed in its place. He tries to loosen it, but it does not become loose."