Muhammad bin Hamzah bin Amr al-Aslami narrates from his father that the Prophet (peace and blessings be upon him) appointed him commander of a detachment. Hamzah (may Allah be pleased with him) said: I set out on that expedition, and he (peace and blessings be upon him) said: "If you capture so-and-so, burn him with fire." Then when I turned to go, he (peace and blessings be upon him) called out to me and said: "If you capture him, kill him, for no one has the right to punish with fire except the Lord of the Fire."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2977