بسم الله الرحمن الرحيم
Allaah – The All Knowing, The All Wise, The Most Benign and Kind, The Lord and Nuturer, The Creator and The Tremendous One, The Magnificent – decreed the creation of the two abodes, the worldly life and the afterlife; then He (Glorified Be He and Free is He from all imperfections) made the first (abode)a place for the (performance of righteous) action and the second (abode) a place of recompense. Indeed He (Glorified Be He and Free is He from all imperfections ) obligated on humans and the Jinn with obligations that are based on commands and prohibitions, and recompense is based on this on the day of judgement.
فَمَن يَعْمَلْ مِثْقَالَ ذَرَّةٍ خَيْرًا يَرَهُ
So whosoever does good equal to the weight of an atom (or a small ant), shall see it.
وَمَن يَعْمَلْ مِثْقَالَ ذَرَّةٍ شَرًّا يَرَهُ
And whosoever does evil equal to the weight of an atom (or a small ant), shall see it.
الحياء في ظل العقيدة الإسلامية: ص ٥٣