فَاِنْ كَانَ لَكُمْ كَيْدٌ فَكِيْدُوْنِ ( المرسلات: ٣٩ )
fa-in
فَإِن
So if
kāna
كَانَ
is
lakum
لَكُمْ
for you
kaydun
كَيْدٌ
a plan
fakīdūni
فَكِيدُونِ
then plan against Me
Fa in kaana lakum kaidun fakeedoon (al-Mursalāt 77:39)
Sahih International:
So if you have a plan, then plan against Me. (Al-Mursalat [77] : 39)
1 Mufti Taqi Usmani
Now, if you have a trick, use the trick against Me.”