[Abu 'Eisa said:] There are narrations on this topic from Ibn Mas'ud and Abu Hurairah. The Hadith if Ibn 'Abbas is a Hasan Sahih Hadith. This is acted upon according to the people of knowledge, they dislike selling the Muhaffalah, and it is the Musarrah that has not been milked by its owner in days or more than that, so the milk accumulates in its udder to impress the purchaser. This is a type of deceit and misrepresentation.
In-book : Book 14, Hadith 70
English translation : Vol. 1, Book 12, Hadith 1268