In Quran Allah states:
"And whosoever puts his trust in Allah, then He will suffice him". (65:3)
Ibn `Abbas (May Allah be pleased with them) said:
When (Prophet) Ibrahim (Abraham) was thrown into the fire, he said: "Allah (Alone) is sufficient for us, and, He is the Best Disposer of affairs.'' So did Messenger of Allah Muhammad (PBUH) when he was told: "A great army of the pagans had gathered against him, so fear them". But this (warning) only increased him and the Muslims in Faith and they said: "Allah (Alone) is sufficient for us, and He is the Best Disposer of affairs (for us)".