Riyad as-Salihin 76
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 (ﷺ) 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)". [Al-Bukhari] .
الثالث‏:‏ عن ابن عباس رضي الله عنهما أيضاً قال‏:‏ ‏"‏حسبنا الله ونعم الوكيل، قالها إبراهيم صلى الله عليه وسلم حين ألقي في النار، وقالها محمد صلى الله عليه وسلم حين قالوا‏:‏ إن الناس قد جمعوا لكم فاخشوهم فزادهم إيمانا وقالوا‏:‏ حسبنا الله ونعم الوكيل‏:‏ ‏(‏‏(‏رواه البخاري‏)‏‏)‏‏.‏