Musnad Ahmad 538:1

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, from Ayyub, from Abu Qilabah, from Abu Tha‘labah: That he asked the Prophet, peace and blessings of Allah be upon him, about the cooking pots of the People of the Scripture, and he said: "If you do not find others besides them, then wash them and cook in them." And he asked him about the meat of donkeys, so he forbade him from that, and from every beast of prey having fangs.