It is narrated from Sayyiduna Salamah bin al-Akwa' (may Allah be pleased with him) that when Khaybar was conquered, in the evening the Companions (may Allah be pleased with them) began lighting fires. the Messenger of Allah (peace and blessings be upon him) said: "Why are you lighting these fires?" They replied: To cook donkey meat. the Messenger of Allah (peace and blessings be upon him) said: "Throw it away and break the pots." A man from the people stood up and said: Shall we throw away the meat and wash the pots and keep them? He (peace and blessings be upon him) said: "Do that, then."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الغصب / 11553