Az-Zalzalah 99:7
فَمَن يَعْمَلْ مِثْقَالَ ذَرَّةٍ خَيْرًا يَرَهُۥ
Faman yaAAmal mithqala tharratinkhayran yarah
"So whoever does an atom's weight of good will see it,"
Az-Zalzalah 99:7, translation by Sahih International
A short reflection
Whoever does an atom's weight of good will see it. Whoever does an atom's weight of evil will see it. No good deed wasted, no bad deed lost.