Musannaf Ibn Abi Shayba 13:1753

Abu Bakr narrated to us, he said: Abu Usama narrated to us, from Awf, from Khilas, from Abu Hurayrah, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The example of the one who returns to his gift is like the example of a dog that eats until, when it is full, it vomits, then it returns to its vomit."