In the name of Allah, Most Gracious, Most Merciful.
Umar Ibn al-Khattab (May Allah be pleased with him) said: “Take account of yourselves before you are taken to account. Weigh your deeds before they are weighed for you and beautify yourselves (with good deeds) for the great display (on the Day of Judgment).”
On the Day when every person will be confronted with all the good he has done, and all the evil he has done, he will wish that there were a great distance between him and his evil. And Allâh warns you against Himself (His Punishment) and Allâh is full of Kindness to the (His) slaves. (Koran 3:30)
So whosoever does good equal to the weight of an atom (or a small ant), shall see it. And whosoever does evil equal to the weight of an atom (or a small ant), shall see it. (Koran 99:7-8)
Knows he not that when the contents of the graves are brought out and poured forth (all mankind is resurrected). And that which is in the breasts (of men) shall be made known. Verily, that Day (i.e. the Day of Resurrection) their Lord will be Well-Acquainted with them (as to their deeds), (and will reward them for their deeds). (Koran 100:9-11)