"It is not permissible for anyone to give a gift then take it back, except a father." Tawus said: "I used to hear the boys say: 'O you who goes back to his vomit!' But I did not realize that the Messenger of Allah had said this as a parable, until we heard that he used to say: 'The likeness of the one who gives a gift then takes it back, is that of the dog which eats its vomit.'"  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَحِلُّ لأَحَدٍ يَهَبُ هِبَةً ثُمَّ يَعُودُ فِيهَا إِلاَّ الْوَالِدَ قَالَ طَاوُسٌ كُنْتُ أَسْمَعُ الصِّبْيَانَ يَقُولُونَ يَا عَائِدًا فِي قَيْئِهِ وَلَمْ أَشْعُرْ أَنَّ رَسُولَ اللَّهِ ﷺ ضَرَبَ ذَلِكَ مَثَلاً حَتَّى بَلَغَنَا أَنَّهُ كَانَ يَقُولُ مَثَلُ الَّذِي يَهَبُ الْهِبَةَ ثُمَّ يَعُودُ فِيهَا وَذَكَرَ كَلِمَةً مَعْنَاهَا كَمَثَلِ الْكَلْبِ يَأْكُلُ قَيْئَهُ  

"It is not permissible for anyone to give a gift then take it back, except a father." Tawus said: "I used to hear the boys say: 'O you who goes back to his vomit!' But I did not realize that the Messenger of Allah had said this as a parable, until we heard that he used to say: 'The likeness of the one who gives a gift then takes it back, is that of the dog which eats its vomit.'" (Using translation from Nasāʾī 3704)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا يَحِلُّ لِأَحَدٍ يَهَبُ هِبَةً يَعُودُ فِيهَا إِلَّا الْوَالِدَ» قَالَ طَاوُسٌ كُنْتُ أَسْمَعُ الصِّبْيَانَ يَقُولُونَ يَا عَائِدًا فِي قَيْئِهِ وَلَمْ أَشْعُرْ أَنَّ رَسُولَ اللهِ ﷺ ضَرَبَ ذَلِكَ مَثَلًا حَتَّى بَلَغَنَا أَنَّهُ كَانَ يَقُولُ «مَثَلُ الَّذِي يَهَبُ الْهِبَةَ ثُمَّ يَعُودُ فِيهَا» وَذَكَرَ كَلِمَةً مَعْنَاهَا «كَمَثَلِ الْكَلْبِ يَأْكُلُ قَيْئَهُ»