It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that when his repentance was accepted, he submitted to the Messenger of Allah (peace and blessings of Allah be upon him): "O Messenger of Allah, all my wealth is charity for Allah and His Messenger; I am giving it up." So the Messenger of Allah (peace and blessings of Allah be upon him) instructed him: "Keep some of your wealth, that will be better for you."