Musnad Ahmad 25:1318

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, and Hajjaj said: Shu'bah narrated to me, he said: I heard Qatadah narrating from Sa'id ibn Jubayr, from Ibn Abbas, from the Prophet, peace and blessings of Allah be upon him, who said: "The one who returns to his gift is like the one who returns to his vomit."