Musannaf Ibn Abi Shayba 13:29

Abu Bakr narrated to us, he said: Abu al-Ahwas Salam ibn Sulaym narrated to us, from Abd al-A’la, from Sa’id ibn Jubayr, from Ibn Abbas, he said: A man came to him and said: "I advanced a thousand dirhams to a man for food, then I took half of my advance from him in food, and I sold it for a thousand dirhams. Then he came to me and said: 'Take the remainder of your capital, five hundred.'" Ibn Abbas said: "That is the recognized good (al-ma’ruf), and he has two rewards."