Sahih Bukhari

Narrated Ibn `Abbas:'Allah is Sufficient for us and He Is the Best Disposer of affairs,"" was said by Abraham when he was thrown into the fire; and it was said by Muhammad when they (i.e. hypocrites) said, ""A great army is gathering against you, therefore, fear them,"" but it only increased their faith and they said: ""Allah is Sufficient for us, and He is the Best Disposer (of affairs, for us)