ibn Abbaas (ra) said, When Prophet Ibrahim (as) was thrown into the fire, he said:
"Allah (alone) is sufficient for us, and , He is the Best Disposer of affairs."
So did the Messenger of Allah, Muhammad (saw) when he was told: "A great army of the pagans have gathered against him, so fear them."
But this (warning) only increased him (saw) and the Muslims in Faith and they said:
"Allah (Alone) is sufficient for us and, He is the Best Disposer of affairs for us."
[Bukhari]