the Lord of Moses and Aaron', for they realised that what they had witnessed in the case of the staff could not have been the result of [mere] sorcery.
27 Tafseer Ibn Kathir
And the sorcerers fell down prostrate. Saying;"We believe in the Lord of Al-`Alamin, the Lord of Musa and Harun."
Thus truth was confirmed, and all that they did was made of no effect. So they were defeated there and returned disgraced. And the sorcerers fell down prostrate. They said;"We believe in the Lord of all that exists, the Lord of Musa and Harun." (7;118-122)
This was a very serious matter, furnishing decisive proof leaving no room for any excuse. Fir`awn's supporters, who sought and hoped that they would prevail over Musa, were themselves defeated. At that moment they believed in Musa and prostrated to Allah, the Lord of Al-`Alamin Who sent Musa and Harun with the truth and an obvious miracle. Fir`awn was defeated in a manner the likes of which the world had never seen, but he remained arrogant and stubborn despite the clear evidence, may the curse of Allah and the angels and all of mankind be upon him. He resorted to arrogance and stubbornness and propagating falsehood. He began to issue threats against them, saying;