Al-'Ankabut 29:66

Liyakfuroo bima ataynahumwaliyatamattaAAoo fasawfa yaAAlamoon

So that they will deny what We have granted them, and they will enjoy themselves. But they are going to know.

thus becoming ungrateful for what We gave to them. Let them have some enjoyment, then they will soon come to know (the ill-fate of their attitude).