فَمَنْ يَعْمَلْ مِثْقَالَ ذَرَّةٍ خَيْرًا يَرَهُ
Whoever does an atom’s weight of good will see it. (99:7)
وَمَنْ يَعْمَلْ مِثْقَالَ ذَرَّةٍ شَرًّا يَرَهُ
And whoever does an atom’s weight of evil will see it. (99:8)
The syntax of the two verses is closely parallel, while khayran and sharran supply the principal contrast. The symmetry makes the judgment comprehensive: accounting is not limited to one moral category. The wāw joins two distinct, semantically matching rules.
The second clause is not superfluous repetition. Without it, the explicit statement would concern good deeds only; the complementary clause makes the corresponding rule for evil deeds equally clear.