Musannaf Ibn Abi Shayba 28:836

Waki’ narrated to us, he said: Sufyan narrated to us, from Simak, from Tamim ibn Tarfah, who said: The Muslims captured a she-camel belonging to a man from the Muslims, and a man from the enemy bought it. Its owner disputed with him before the Prophet, may Allah bless him and grant him peace. He (the owner) established the evidence, so the Prophet, may Allah bless him and grant him peace, judged that he should pay him the price for which he bought it from the enemy, otherwise he should leave him and it (the camel) alone.