Saad • BN-TAFSEER-IBN-E-KASEER
﴿ إِنَّآ أَخْلَصْنَٰهُم بِخَالِصَةٍۢ ذِكْرَى ٱلدَّارِ ﴾
“for, verily, We purified them by means of a thought most pure: the remembrance of the life to come.”
Please check ayah 38:49 for complete tafsir.