Musannaf Ibn Abi Shayba 13:1333

Abu Bakr narrated to us, he said: Abd al-Salam narrated to us, from Layth, from Hajjaj ibn Yasar, that a man bought some skins of ghee from a man and paid his companion in cash, but the skins were found to be deficient. He wanted to offset [the deficiency] with some of the dirhams. Ibn Umar said: "Take all of your purchase, or return all of it."