The Messenger of Allah ﷺ 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, Messenger of Allah, he is saying that he is a Muslim. The Messenger of Allah ﷺ said: There are people among you in whose faith we trust. Furat ibn Hayyan is one of them.  

أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ بِقَتْلِهِ وَكَانَ عَيْنًا لأَبِي سُفْيَانَ وَكَانَ حَلِيفًا لِرَجُلٍ مِنَ الأَنْصَارِ فَمَرَّ بِحَلْقَةٍ مِنَ الأَنْصَارِ فَقَالَ إِنِّي مُسْلِمٌ فَقَالَ رَجُلٌ مِنَ الأَنْصَارِ يَا رَسُولَ اللَّهِ إِنَّهُ يَقُولُ إِنِّي مُسْلِمٌ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنْكُمْ رِجَالاً نَكِلُهُمْ إِلَى إِيمَانِهِمْ مِنْهُمْ فُرَاتُ بْنُ حَيَّانَ