20:58
فَلَنَأْتِيَنَّكَ بِسِحْرٍۢ مِّثْلِهِۦ فَٱجْعَلْ بَيْنَنَا وَبَيْنَكَ مَوْعِدًۭا لَّا نُخْلِفُهُۥ نَحْنُ وَلَآ أَنتَ مَكَانًۭا سُوًۭى
Then we will surely bring you magic like it, so make between us and you an appointment, which we will not fail to keep and neither will you, in a place assigned."
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Fir`awn describes Musa's Proofs as being Magic and Their Agreement to hold a Contest
Allah, the Exalted, informs of what Fir`awn said to Musa when he showed him the great proof. This great sign to Fir`awn was Musa casting down his stick which became a huge snake, and his pulling his hand out from under his arm while it was glowing white without any illness. At this, Fir`awn said, "This is magic that you have brought to us to bewitch us and conquer the people, so that they will follow you. Then you will outnumber us." Fir`awn then said, "Your plan will not work. We have magic just like yours, so do not let yourself be deceived by that what you are doing."
فَاجْعَلْ بَيْنَنَا وَبَيْنَكَ مَوْعِداً
(so appoint a meeting between us and you,) Meaning, `a day that we can come together to present some of our magic to confront yours. It will be at a specified place and time.' With this, Musa said to them,
مَوْعِدُكُمْ يَوْمُ الزِّينَةِ
(Your appointed meeting is the day of festival,) That was the day of their celebration and their New Year's festivity. It was a holiday for them when they took vacation from their work and came together for a large gathering. This day was selected so that all of the people could witness the power of Allah to do whatever He wills. They would see the miracles of the prophets and the futility of magic to contest the supernatural prophetic powers. This is why Musa said,