The one who judges between His Servants in this life and the Hereafter with His justice and fairness. He will not oppress anyone to the extent of an atom's weight and none will be made to carry the encumbrance of another. No servant will be recompensed in a way that is greater than the magnitude of his sin, he will be given only what he deserves. Not a single person's right will be denied him, He is the Just in His regulation and decree.
“Indeed My Lord is upon the Straight Path.”
[Hud (11): 56]
“Say: I am on clear proof from my Lord, but you deny [the truth]. I do not have what you are impatient for (i.e. the Punishment). The judgement is only for Allah, He declares the truth, and He is the best of judges.”
[al-An'am (6): 57]
From “Explanation to the Beautiful and Perfect Names of Allah” — Shaykh as-Sa’di (d.1376H)