Harithah bin Mudarrib narrates from Furat bin Hayyan (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) had ordered him to be killed; he was a spy for Abu Sufyan and, I think he said, an ally of a man from the Ansar. He passed by a gathering of the Ansar and said: "I am a Muslim." One of them said: O Messenger of Allah (peace and blessings be upon him), he says: I am a Muslim. The Messenger of Allah (peace and blessings be upon him) said: "Among them are some men whom we entrust to their faith, and among them is Furat bin Hayyan."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18437