فَمَنْ يَعْمَلْ مِثْقَالَ ذَرَّةٍ خَيْرًا يَرَهُ
Whoever performs an atom’s weight of good will see it. (99:7)
Man is a conditional noun; yaʿmal is the jussive conditional verb and yarahu its jussive response. Mithqāla dharratin represents an extremely small measure; khayran specifies the good under discussion. The pronoun of yarahu can refer to that deed or its disclosed consequence.
The force comes from the combination of a general conditional principle with the smallest imaginable example. This is not mere brevity; it is a comprehensive proposition: even minor deeds fall within accountability.