﴿ وَمَا هَٰذِهِ ٱلْحَيَوٰةُ ٱلدُّنْيَآ إِلَّا لَهْوٌۭ وَلَعِبٌۭ ۚ وَإِنَّ ٱلدَّارَ ٱلْءَاخِرَةَ لَهِىَ ٱلْحَيَوَانُ ۚ لَوْ كَانُوا۟ يَعْلَمُونَ ﴾

“for, [if they did, they would know that] the life of this world is nothing but a passing delight and a play - whereas, behold, the life in the hereafter is indeed the only [true] life: if they but knew this!”

Please check ayah 29:66 for complete tafsir.