Abu al-Zinad (may Allah have mercy on him) narrates from Sa'id bin al-Musayyib (may Allah have mercy on him): "Selling an animal for meat has been forbidden."
Abu al-Zinad (may Allah have mercy on him) said: The people I met used to forbid selling an animal for meat. Abu al-Zinad (may Allah have mercy on him) said: This used to be written in the letters of appointment of the governors in the time of Aban bin Uthman and Hisham bin Isma'il, forbidding it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10574