His threats against them resulted only in an increase in their faith and submission to Allah, for the veil of disbelief had been lifted from their hearts and the truth became clear to them because they knew something that their people did not: that what Musa had done could not have been done by any human being unless Allah helped him, making it proof and an evidence of the truth of what he had brought from his Lord. Then Fir`awn said to them:
ءَامَنتُمْ لَهُ قَبْلَ أَنْ ءَاذَنَ لَكُمْ
(You have believed in him before I give you leave.) meaning, `you should have asked my permission for what you did, and you did not consult with me; if I had given you permission you could have done it, and if I did not allow you, you should not have done it, for I am the ruler and the one to be obeyed.'
They said, "There is no harm. We are to return to our Lord. (26:50)
When the Pharaoh threatened the magicians to kill them, and to cut their limbs and to crucify them, the magicians replied rather indifferently, the gist of their reply was, ` You do whatever you can. We shall lose nothing. Even if we are killed we will go back to our Lord, where there is nothing but comfort'.
It is worth noting here that the magicians who had involved all their lives practicing the sinful sorcery and who believed in the Pharaoh's claim to be a god, rather, used to worship him, pronounced faith in Allah before that tyrant and despotic king and the entire nation. This was in itself something most astonishing and courageous, but it was not just the pronouncement of faith in Allah, but a demonstration of such deep devotion as if they could see the Dooms Day and the Hereafter before their eyes. The blessings and bounties of the Hereafter were within their sight, for which they raised themselves over and above any punishment or torment of this world, and said فَاقْضِ مَا أَنتَ قَاضٍ that is ` You do whatever you are to do (20:72). We are not going back from our faith'. This in fact was also a miracle of Sayyidna Musa (علیہ السلام) which was no less than the miracle of the staff and the luminous hand. Many incidents of similar nature have also occurred with our Holy Prophet ﷺ . In one such incident a drastic change had occurred in a seventy years old infidel in that within a minute he not only converted to Islam, but was ready to lay down his life to become a martyr.
The embracing of the Faith by the magicians was a cause of great disgrace to Pharaoh. So, in order to salvage his position, he dubbed the whole incident a conspiracy. He alleged that they had colluded with Moses and that they had intentionally pretended to be defeated by him, so that Moses’s greatness could be impressed on the people’s hearts. Pharaoh announced his decision to the magicians that they would be punished for sedition; that their hands and legs would be cut off at random and they would be publicly crucified. In spite of these draconian orders, the magicians were not discouraged. Those very same magicians who had earlier pledged their allegiance to Pharaoh (verse 41) and asked to be rewarded, now fearlessly proclaimed that whatever Pharaoh did, they were not going to be dissuaded from accepting Moses’s religion. The reason for this high morale of theirs was the discovery of Faith. A man bears a loss when, by this loss, he expects to find something greater. Before embracing the faith, the greatest things the magicians could hope to have now were Pharaoh’s approval and his reward. But on embracing true religion, God and His Paradise now appeared to them to be greater than all else. That is why they were now ready to bear the losses of those very things which, prior to embracing the Faith, they had held too dear to part with.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.