Q 125: What is the Qur'anic textual proof that being judged rightfully (Just Retaliation) is a fact of the Last Day?
A--- Allah the Almighty says: {Surely! Allah wrongs not even of the weight of an atom (or a small ant), but if there is any good (done), He doubles it, and gives from Him a great reward}. (AnNisa', 40)
Allah the Almighty says: {This Day shall every person be recompensed for what he earned. This Day no injustice (shall be done to anybody). Truly Allah is Swift in reckoning. And warn them (O Muhammad (Peace be upon him)) of the Day that is drawing near (i.e. the Day of Resurrection), when the hearts will be choking the throats, and they can neither return them (hearts)
to their chests nor can they throw them out. There will be no friend, nor an intercessor for the Zalimun (polytheists and wrongdoers), who could be given heed to. Allah knows the fraud of the eyes, and all that the breasts conceal. And Allah judges with truth, while those to whom they invoke besides Him, cannot judge anything. Certainly, Allah! He is the All-Hearer, the All-Seer}.
Allah the Almighty says: {And it will be judged between them with truth, and they will not be wronged}. (Az-Zumar, 69)
Reference: 200 FAQ On Muslims Belief - Shiekh Hafiz Ibn Ahmed Al Hakami