It is narrated from Sayyiduna Abdullah bin Umar and Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) that the Prophet (peace and blessings be upon him) said: "It is not lawful for a man to give a gift or make a present and then take it back, except a father regarding what he gives his child. The likeness of one who gives a gift and then takes it back is that of a dog that eats, and when it is full it vomits, then returns to its own vomit (and licks it up)." This hadith has a sahih (authentic) chain of narration, for I know of no disagreement about the integrity ('adalah) of Amr bin Shu'ayb; they differed only about his father's hearing from his grandfather.