﴿ وَدَخَلَ جَنَّتَهُۥ وَهُوَ ظَالِمٌۭ لِّنَفْسِهِۦ قَالَ مَآ أَظُنُّ أَن تَبِيدَ هَٰذِهِۦٓ أَبَدًۭا ﴾

“And having [thus] sinned against himself, he entered his garden, saying, "I do not think that this will ever perish!”

Please check ayah 18:36 for complete tafsir.