﴿ فَلَنَأْتِيَنَّكَ بِسِحْرٍۢ مِّثْلِهِۦ فَٱجْعَلْ بَيْنَنَا وَبَيْنَكَ مَوْعِدًۭا لَّا نُخْلِفُهُۥ نَحْنُ وَلَآ أَنتَ مَكَانًۭا سُوًۭى ﴾

“In that case, we shall most certainly produce before thee the like thereof! Appoint, then, a tryst between us and thee - which we shall not fail to keep, nor [mayest] thou -at a suitable place!"”

Please check ayah 20:59 for complete tafsir.