Sayyiduna Thawban (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever leaves behind a treasure (for which zakat was not paid), then on the Day of Resurrection it will become a bald snake for him, with two black spots over its eyes. That snake will chase him, and he will ask, 'Woe to you! Who are you?' It will reply, 'I am your treasure which you left behind (after your death).' Then it will keep chasing him until it puts its hand in his mouth and chews him, and then it will chew his entire body."