Musannaf Ibn Abi Shayba 13:2163

Abu Bakr narrated to us, he said: Yazid ibn Harun narrated to us, he said: al-Taymi informed us, from Abu Uthman al-Nahdi, he said: Abdullah said: Whoever buys a *muhaffala* (an animal whose milk has been withheld in the udder to make it appear to have a large yield) and returns it, then let him return with it a *sa'* (of food).