Wages (Kitab Al-Ijarah)
Dawud :: Book 23 : Hadith 3532
Narrated Abdullah Ibn Umar ; Abdullah Ibn Abbas:
The Prophet (peace_be_upon_him) 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.