فَإِن كَانَ لَكُمْ كَيْدٌ فَكِيدُونِ
English Translation
So if you have a plan, then plan against Me.
English Transliteration
Fain kana lakum kaydun fakeedooni
Tafsir of Verse 39
if you have a trick, try you now to trick Me!'
Now, if ye have a trick (or plot), use it against Me!