لِيَكْفُرُوْا بِمَآ اٰتَيْنٰهُمْۙ وَلِيَتَمَتَّعُوْاۗ فَسَوْفَ يَعْلَمُوْنَ ( العنكبوت: ٦٦ )
Li yakfuroo bimaaa aatainaahum wa li yatamatta'oo fasaw fa ya'lamoon (al-ʿAnkabūt 29:66)
So that they will deny what We have granted them, and they will enjoy themselves. But they are going to know. (Al-'Ankabut  : 66)
1 Mufti Taqi Usmani
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).