Thawr bin Yazid (may Allah have mercy on him) narrates with his chain that he (peace and blessings be upon him) forbade it on the Day of Khaybar.
This chain is mudtarib (inconsistent), and along with its inconsistency it contradicts the hadith of the trustworthy narrators.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19447