He (Fir`awn) said: "Have you come to drive us out of our land with your magic, O Musa! Then verily, we can produce magic the like thereof; so appoint a meeting between us and you, which neither we nor you shall fail to keep, in an open place where both shall have a just and equal chance."
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 مَوْعِدًا
...
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,