Verily the Hour is coming. My design is to keep it hidden for every soul to receive its reward, by the measure of its endeavor. Qur'an 20: 15.
We shall set up scales of justice for the Day of Judgment so that not a soul will be dealt with unjustly in the least. And if there be (no more than) the weight of a mustard seed We will bring it (to account): and enough are We to take account. Qur'an 21: 47.
(And it will be said): Read thy book. Thy soul sufficeth as reckoner against thee this day. Qur'an 17: 14.