[as if] to prove their ingratitude for all that We have granted them! Enjoy, then, your [brief] life: but in time you will come to know [the truth]!

(As if) to show their ingratitude for the (favours) We have bestowed on them! Then enjoy (your brief day); but soon will ye know (your folly).

So as to disbelieve in that which We have given them. (Unto such it is said): Enjoy yourselves awhile, but ye will come to know.

So as to be ungrateful for that which We have given them. So enjoy yourselves a while -- you will soon come to know.

So that they will deny what We have granted them. Then enjoy yourselves, for you are going to know.