Abu Dawud
Wages
Book Number: 017 / Hadith Number: 3532
Narated By Abdullah Ibn Umar Abdullah Ibn Abbas : The Prophet (pbuh) said: It is not lawful for a man to make a donation or give a gift and then take it back, except a father regarding what he gives his child. One who gives a gift and then takes it back is like a dog which eats and vomits when it is full, then returns to its vomit.