"The parable of the one who gives a gift, and then takes it back, is that of a dog who eats until he is full, and vomits, then he returns to his vomit."

There are narrations on this topic from Ibn 'Abbas and 'Abdullah bin 'Amr.
Jami` at-Tirmidhi Book 31, Hadith 8
← Previous Hadith "Give gifts, for indeed the gift removes bad feelings from the chest. And let the neighbor not look down upon (the gift of) her neighbor, even if it be the lower shanks of sheep."

This Hadith is Gharib from this route. Abu Ma'shar's name is Najih, the freed slave of Banu Hisham. Some of the people of knowledge criticized him due to his poor memory.

Jami` at-Tirmidhi Book 31, Hadith 7 Next Hadith → "It is not lawful for a man to give a gift and then take it back, except in the case of the father with what he gave to his son. And the parable of the one who gives a gift, and then takes it back, is that of a dog who eats until he is full, and vomits, then he returns to his vomit."

This Hadith is Hasan Sahih. Ash-Shafi'i said: "It is not lawful for one who confers something to take it back, except in the case of the father. He may take back what he gave his son" and he used this Hadith as proof.

Jami` at-Tirmidhi Book 31, Hadith 9