Al-Adab Al-Mufrad, Book 23, Hadith 417 (English) ⓘ
Ibn 'Abbas reported that the Prophet, may Allah bless him and grant him peace, said, "We do not give a bad example. The one who takes back his gift is like the dog who returns to his own vomit."
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ: حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: لَيْسَ لَنَا مَثَلُ السَّوْءِ، الْعَائِدُ فِي هِبَتِهِ، كَالْكَلْبِ يَرْجِعُ فِي قَيْئِهِ.
also referenced under: Hadith 417 (Reference) & Book 23, Hadith 3 (In-Book)