ٱلْمُلْكُ يَوْمَئِذٍ ٱلْحَقُّ لِلرَّحْمَـٰنِ ۚ وَكَانَ يَوْمًا عَلَى ٱلْكَـٰفِرِينَ عَسِيرًا
True sovereignty, that Day, is for the Most Merciful. And it will be upon the disbelievers a difficult Day.
The Criterion
ٱلْمُلْكُ يَوْمَئِذٍ ٱلْحَقُّ لِلرَّحْمَـٰنِ ۚ وَكَانَ يَوْمًا عَلَى ٱلْكَـٰفِرِينَ عَسِيرًا
True sovereignty, that Day, is for the Most Merciful. And it will be upon the disbelievers a difficult Day.
Nearby ayahs help place verse 25:26 in sequence and meaning.
أَصْحَـٰبُ ٱلْجَنَّةِ يَوْمَئِذٍ خَيْرٌ مُّسْتَقَرًّا وَأَحْسَنُ مَقِيلًا
The companions of Paradise, that Day, are [in] a better settlement and better resting place.
وَيَوْمَ تَشَقَّقُ ٱلسَّمَآءُ بِٱلْغَمَـٰمِ وَنُزِّلَ ٱلْمَلَـٰٓئِكَةُ تَنزِيلًا
And [mention] the Day when the heaven will split open with [emerging] clouds, and the angels will be sent down in successive descent.
وَيَوْمَ يَعَضُّ ٱلظَّالِمُ عَلَىٰ يَدَيْهِ يَقُولُ يَـٰلَيْتَنِى ٱتَّخَذْتُ مَعَ ٱلرَّسُولِ سَبِيلًا
And the Day the wrongdoer will bite on his hands [in regret] he will say, "Oh, I wish I had taken with the Messenger a way.
يَـٰوَيْلَتَىٰ لَيْتَنِى لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا
Oh, woe to me! I wish I had not taken that one as a friend.