Amr bin Shu'aib bin Muhammad عمرو بن شعيب بن محمد السهمي · The Book of Gifts

"The likeness of the one who takes back his gift is that of a dog which vomits, then goes back to its vomit." (One of the narrators) Al-Awza'i said: "I heard him narrating this Hadith to 'Ata bin Abi Rabah."