Sahih Muslim Book 10, Hadith Number 3777.

Chapter : Prohibition of the sale of excess water in the barren lands, and preventing people to use it, and hiring a camel to cover a she-camel.

Abu Sa’id al-Khudri (Allah be pleased with him) reported that in the time of Allah’s Messenger (may peace be upon him) a man suffered loss in fruits he had bought and his debt increased; so Allah’s Messenger (may peace be upon him) told (the people) to give him charity and they gave him charity, but that was not enough to pay the debt in full, whereupon Allah’s Messenger (may peace be upon him) said to his creditors:” Take what you find, you will have nothing but alms.