(Al-Infithwar) 82 : 5
عَلِمَتْ نَفْسٌ مَا قَدَّمَتْ وَأَخَّرَتْ
Every soul will know what it sent ahead and what it left behind.
That is, on the Day of Judgement, everyone will find whatever good and evil he/she earned in this world, and the legacy of good and evil he/she left for descendants, as explained in verses 36: 12 and 45. See explanation 4: 85; 16: 24-25; and 75: 13.