Musannaf Ibn Abi Shayba 13:856

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Isma’il ibn Abi Khalid, from Qays ibn Abi Hazim, he said: It used to be said, "At-tasriyah (withholding milk in the udder of an animal to deceive the buyer) is deception."