Musannaf Ibn Abi Shayba 28:614

Abu Bakr narrated to us, he said: Abd al-Rahim ibn Sulayman narrated to us, from Muhammad ibn Ishaq, from Yazid ibn Abi Habib, from Bukayr ibn Abd Allah ibn al-Ashajj, from Abu Ishaq Ibrahim al-Dawsi, from Abu Hurayrah al-Dawsi, who said: The Messenger of Allah (may Allah bless him and grant him peace) sent us on a military expedition and said: "If you capture so-and-so and so-and-so, then burn them with fire." Then, when the next day came, he sent to us: "I had ordered you to burn these two men, but I have come to see that no one should punish with fire except Allah. So, if you capture them, then kill them."