Yahya related to me from Malik from Zayd ibn Aslam from Said ibnal-Musayyab that the Messenger of Allah, may Allah bless him and granthim peace, forbade bartering live animals for meat. (ES)
USC-MSA web (English) reference: Book 31, Hadith 64 (ES)
Arabic reference (ES): Book 31, Hadith 1356 (ES)