Sunan ad-Darimi

Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) said: We were sitting with the Messenger of Allah (peace and blessings be upon him) when a man came with a piece of gold the size of an egg, which he had found in a battle. And Ahmad (bin Khalid) said that it was obtained from a gold mine, and this is correct. That man said: O Messenger of Allah! Take this, it is charity from me, and by Allah, I have no other wealth besides this. Upon hearing this, the Messenger of Allah (peace and blessings be upon him) turned away from him. Then the man came to your left side and said the same, then he came in front of you and said the same, so you said angrily: "Give it here," then the Prophet (peace and blessings be upon him) threw that gold far away, which, if it had hit someone, would have either wounded him or struck him hard. Then the Prophet (peace and blessings be upon him) said: "One of you brings all his wealth and has nothing left except that, then he gives it in charity, then sits and stretches his hand out to people. The real charity is that after giving charity, its owner remains wealthy. Go, take your wealth, we have no need of it." So that man picked up the gold the size of an egg and left. Imam Darimi (may Allah have mercy on him) said: Imam Malik (may Allah have mercy on him) used to say: When a man gives his wealth in charity to the needy, he should give one third of his wealth in charity.