I commanded you to burn so-and-so and so-and-so, but no one punishes with fire except Allah. So if you find them, kill them

Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) sent us out on an expedition and said: "If you find so-and-so and so-and-so", referring to two men from Quraysh whom he named, "then burn them with fire." Then, when we were set to go out, the Messenger of Allah (may Allah's peace and blessings be upon him) said: "I commanded you to burn so-and-so and so-and-so, but no one punishes with fire except Allah. So if you find them, kill them."