Inna natmaAAu an yaghfira lana rabbuna khatayana an kunna awwala almu'mineen (surah Shuara: 51)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(26:51) and we expect that our Lord will forgive us our sins because we are the first to believe. " *40

Innaa natma`u ai yaghfira lanaa Rabbunna khataa yaanaaa an kunnaaa awwalal mu`mineen

*40) That is, "We have to return to our Lord in any case. If you kill us now, we shall present ourselves before Him just today, and we have nothing to worry in this. We rather expect that we shall be forgiven our sins and errors because out of this eatire gathering we were the first to believe as soon as reality became known to us."
This reply of the magicians made two things absolutely clear to the people who had been gathered together by Pharaoh heralds
: First, that Pharaoh was a dishonest obdurate and deceitful person. When he saw that Moses had come out successful in the contest which he himself had arrangedto be decisive, he concocted a plot and forced the magicians to confess it by coercion and threats. Had there been any truth in it, the magicians would not have readilyoffered to have their hands and feet cut off on opposite sides and get crucified. The fact that the magicians remained steadfast and firm in their belief even in the face of such a horrible threat, proves that the accusation of plotting a conspiracy against Pharaoh was baseless. The fact was that the magicians being experts in their art had realized that what Moses had displayed was no magic, but surely a manifestation of the powers of Allah, Lord of the universe.
Secondly, thousands of the people who had gathered together from all corners of the land had themselves witnessed the great moral change that had occurred in the magicians as soon as they professed belief in the Lord of the universe. The same magicians who had been summoned to strengthen and secure the ancestral creed by means of their magic and who, a minute before, were humbly begging Pharaoh for rewards had now become so bold and ennobled spiritually that they would not take any notice of Pharaoh's powers and his threats and were even prepared to face death and extreme physical torture for the sake of their Faith. Thus psychologically there could not be a better occasion to expose the polytheistic ,creed of the Egyptians in their own eyes and help impress the truth of Moses' religion in the minds of the people.