So that they will deny what We have granted them, and they will enjoy themselves. But they are going to know.
The Saheeh International Quran Translation
لِيَكْفُرُوا۟ بِمَآ ءَاتَيْنَٰهُمْ وَلِيَتَمَتَّعُوا۟ فَسَوْفَ يَعْلَمُونَSo that they will deny what We have granted them, and they will enjoy themselves. But they are going to know.