وَعَنْهُ أَيْضًا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ الْعَائِدُ فِي هِبَتِهِ كَالْعَائِدِ فِي قَيْئِهِ قَالَ قَتَادَةُ وَلَا أَعْلَمُ الْقَيْئَ إِلَّا حَرَامًا
Narrated by Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: The one who takes back a gift is like a person who starts licking his own vomit. Imam Qatadah said: In my opinion, vomit is forbidden.