Jihad (Kitab Al-Jihad)

Dawud :: Book 14 : Hadith 2646

Narrated Furat ibn Hayyan:

The Apostle of Allah (peace_be_upon_him) commanded to kill him: he was a spy of AbuSufyan and an ally of a man of the Ansar. He passed a circle of the Ansar and said: I am a Muslim. A man from the Ansar said, Apostle of Allah, he is saying that he is a Muslim. The Apostle of Allah (peace_be_upon_him) said: There are people among you in whose faith we trust. Furat ibn Hayyan is one of them.

Source materials are from the University of Southern California MSA site
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