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Umar b. Khattab (Allah be
pleased with him) reported: I donated a pedigree horse in the path of
Allah. Its possessor made it languish. I thought that he would sell it
at a cheap price. I asked Allah's Messenger (may peace be upon him)
about it, whereupon he said: Don't buy it and do not get back your
charity, for one who gets back the charity is like a dog who swallows
its vomit. This hadith has been narrated on the authority of Malik b.
Anas with the same chain of transmitters but with this addition: "Don't
buy that even if he gives you for one dirham."
Sahih Muslim Book 12. Gifts
Chapter : Disapproval of buying the donated property
by the donor himself. 
