"The Messenger of Allah said: 'It is not permissible for anyone to give a gift then take it back, except from one's son.'" Tawus said: "When I was young I used to hear (the phrase), 'The one who goes back to his vomit,' but we did not realize that this was a similitude." He said: "The likeness of the one who does that is that of a dog which eats then vomits, then goes back to its vomit."
Reference: Sunan an-Nasa'i 3692 In-book : Book 32, Hadith 5 English translation : Vol. 4, Book 32, Hadith 3722
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