What did Prophet Ibrahim say when thrown into the fire?

ٱلَّذِينَ قَالَ لَهُمُ ٱلنَّاسُ إِنَّ ٱلنَّاسَ قَدۡ جَمَعُواْ لَكُمۡ فَٱخۡشَوۡهُمۡ فَزَادَهُمۡ إِيمَـٰنً۬ا وَقَالُواْ حَسۡبُنَا ٱللَّهُ وَنِعۡمَ ٱلۡوَڪِيلُ . فَٱنقَلَبُواْ بِنِعۡمَةٍ۬ مِّنَ ٱللَّهِ وَفَضۡلٍ۬ لَّمۡ يَمۡسَسۡہُمۡ سُوٓءٌ۬ وَٱتَّبَعُواْ
رِضۡوَٲنَ ٱللَّهِ‌ۗ وَٱللَّهُ ذُو فَضۡلٍ عَظِيمٍ

Those (i.e. believers) unto whom the people (hypocrites) said, "Verily, the people (pagans) have gathered against you (a great army), therefore, fear them." But it (only) increased them in Faith, and they said: "Allah (Alone) is Sufficient for us, and He is the Best Disposer of affairs (for us)."
So they returned with Grace and Bounty from Allah. No harm touched them; and they followed the good Pleasure of Allah. And Allah is the Owner of Great Bounty.

(Quran 3:173-174)

Narrated by Ibn Abbas R.A.: "Allah (Alone) is Sufficient for us, and He is the Best Disposer of affairs (for us)" was said by Ibraheem A.S. when he was thrown into the fire; and it was said by Muhammad S.A.W.S. when they (i.e. hypocrites) said, "Verily, the people (pagans) have gathered against you (a great army), therefore, fear them," but it (only) increased them in faith and they said: "Allah (Alone) is Sufficient for us, and He is the Best Disposer of affairs (for us)."
[Sahih Al Bukhari 6/4563]