It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "The likeness of the one who takes back his charity is that of a dog that vomits, then returns to its vomit and eats it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10648