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. (DE)
USC-MSA web (English) reference: Book 31, Hadith 64 (DE)
Arabic reference (DE): Book 31, Hadith 1356 (DE)