And [he added to himself.] By God, I shall most certainly bring about the downfall of your idols as soon as you have turned your backs and gone away!"

"And by God, I have a plan for your idols - after ye go away and turn your backs"..

And, by Allah, I shall circumvent your idols after ye have gone away and turned your backs.

And, by Allah! I will certainly plan against your idols after you go away, turning your backs.

And [I swear] by Allah , I will surely plan against your idols after you have turned and gone away."