( مَن جَاءَ بِالْحَسَنَةِ) (Whoever comes [on the Day of Judgement] with a good deed): The Arabic word of (good deed) is not a feminine word as mistakenly some people think because of the letter it ends with (T). Rather it indicates exaggeration. We earn rewards through good deeds.

( وَمَن جَاءَ بِالسَّيِّئَةِ فَلَا يُجْزَىٰ إِلَّا مِثْلَهَا) (Whoever comes [on the Day of Judgement] with a good deed will have ten times the like thereof [to his credit], and whoever comes with an evil deed will not be recompensed except the like thereof): In a Qudsi Hadith, the Prophet (saws) told us that Allah (swt) says:

“Allah ordered (the appointed angels over you) that the good and the bad deeds be written, and He then showed (the way) how (to write). If somebody intends to do a good deed and he does not do it, then Allah will write for him a full good deed (in his account with Him); and if he intends to do a good deed and actually did it, then Allah will write for him (in his account) with Him (its reward equal) from ten to seven hundred times to many more times: and if somebody intended to do a bad deed and he does not do it, then Allah will write a full good deed (in his account) with Him, and if he intended to do it (a bad deed) and actually did it, then Allah will write one bad deed (in his account) .”[1]

What a greatness and mercy from Allah (swt); that a single good deed is multiplied by ten, and much more. Allah (swt) says:

  مَّثَلُ الَّذِينَ يُنفِقُونَ أَمْوَالَهُمْ فِي سَبِيلِ اللَّهِ كَمَثَلِ حَبَّةٍ أَنبَتَتْ سَبْعَ سَنَابِلَ فِي كُلِّ سُنبُلَةٍ مِّائَةُ حَبَّةٍ ۗ وَاللَّهُ يُضَاعِفُ لِمَن يَشَاءُ ۗ وَاللَّهُ وَاسِعٌ عَلِيمٌ 

(The example of those who spend their wealth in the way of Allah is like a seed [of grain] which grows seven spikes; in each spike is a hundred grains. And Allah multiplies [His reward] for whom He wills. And Allah is all-Encompassing and Knowing.) (Al-Baqara: 261)

( وَهُمْ لَا يُظْلَمُونَ ) (and they will not be wronged): This is the ultimate justice and mercy.

[1] Sahih Al-Bukhari, Book of Hearts Tendering, Chapter of: If somebody intends to do a good deed, Hadith  No. 6126.