Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
كتاب التفسير
(6) The Statement of Allah: "...And those who hoard up gold and silver (AI-Kanz—the money, the Zakãt of which has not been paid) and spend it not in the Way of Allah—announce to them a painful torment." (V.9:34)