Musnad Abu Ya'la al-Mawsili 42:210

Zuhayr narrated to us, Waki' narrated to us, Yunus bin Abi Ishaq narrated to us, from Jabr bin Nawf Abu al-Wadak, from Abu Sa'id, who said: We obtained donkeys on the day of Khaybar, and the pots were boiling with them. The Messenger of Allah (ﷺ) said: "What is this?" We said: "Donkeys that we obtained." He said: "Are they wild or domestic?" We said: "No, rather they are domestic." He said: "Then overturn them (the pots)." He said: So we overturned them.