Tafsir of Saba' 34:26

Say: Our Lord will gather us together on the Day of Resurrection, at the time of the gathering and the reckoning. Then He will judge between us in truth; He, glorified be He, will judge and decide between us after the realities of each of us and each of you become manifest, with justice, by causing those who are in the right to enter Paradise and those who are in the wrong to enter the Fire. He is the Fattah (the Opener/Judge), who decides upon matters that are closed—how much more so, then, in the case of clear ones, such as the invalidation of polytheism and the affirmation of monotheism? Or, He is the Judge of every matter, whether hidden or manifest. If the first interpretation is intended, the intensive form signifies the quality of judgment; if the second, it signifies its scope. Perhaps the first is more appropriate, as it contains an indication of why the resolution of disputes is termed "opening" (fath); it is originally used because that which is judged is likened to a closed matter, just as it is likened to a knotted matter in their saying: "The solver of problems." Isa recited: Al-Fatih (The Opener). Al-Alim (The All-Knowing)—regarding what is required to be judged, or regarding all things.