The Book of Manners and Etiquette
Ṣaḥīḥ Muslim 5611
أَغْيَظُ رَجُلٍ عَلَى اللَّهِ يَوْمَ الْقِيَامَةِ وَأَخْبَثُهُ وَأَغْيَظُهُ عَلَيْهِ رَجُلٌ كَانَ يُسَمَّى مَلِكَ الأَمْلاَكِ لاَ مَلِكَ إِلاَّ اللَّهُ
aghyaẓu rajulin ʿalā-Llāh yawma al-qiyāmah wa-akhbathuhu wa-aghyaẓuhu ʿalayhi rajulun kāna yusammā malika al-amlāki lā malika illā-Llāh
Transliteration generated from the Arabic vowel marks
The full narration
Abu Huraira reported from Allah's Messenger (ﷺ) so many ahadith and one of them was this that Allah's Messenger (ﷺ) said:The most wretched person in the sight of Allah on the Day of Resurrection and the worst person and target of His wrath would of the person who is called Malik al-Amlak (the King of Kings) for there is no king but Allah
Source
Ṣaḥīḥ Muslim · 5611
Ṣaḥīḥ