"Indeed, We chose them for an exclusive quality: the remembrance of the [Final] Abode," meaning: the Hereafter, and the remembrance is Paradise.
﴿إِنَّا أَخْلَصْنَاهُم بِخَالِصَةٍ ذِكْرَى الدَّارِ﴾ يَعْنِي: الدَّار الْآخِرَة , والذكرى: الْجنَّة.