﴿ ٱلْمُلْكُ يَوْمَئِذٍ ٱلْحَقُّ لِلرَّحْمَٰنِ ۚ وَكَانَ يَوْمًا عَلَى ٱلْكَٰفِرِينَ عَسِيرًۭا ﴾

“on that Day [it will become obvious to all that] true sover­eignty belongs to the Most Gracious [alone]: hence, a Day of distress will it be for all who deny the truth,”

true Sovereignty on that day will belong to the Compassionate One with no one else sharing it with Him and it that day will be a hard day for the disbelievers in contrast to the believers.