Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:25:26 –

True sovereignty, that Day, is for the Most Merciful. And it will be upon the disbelievers a difficult Day.  

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.
القرآن:٢٥:٢٦ –

الْمُلْكُ يَوْمَئِذٍ الْحَقُّ لِلرَّحْمَٰنِ ۚ وَكَانَ يَوْمًا عَلَى الْكَافِرِينَ عَسِيرًا  

{الملك يومئذ الحق للرحمن} لا يشركه فيه أحد {وكان} اليوم {يوما على الكافرين عسيرا} بخلاف المؤمنين.