" مَثَلُ الَّذِي يَرْجِعُ فِي صَدَقَتِهِ كَمَثَلِ الْكَلْبِ يَرْجِعُ فِي قَيْئِهِ فَيَأْكُلُهُ "
'Abdullah bin 'Abbas said: "The Messenger of Allah said: 'The likeness of the one who takes back his gift, is that of a dog which goes back to its vomit and eats it.'"