Sahih al-Bukhari 6205
Sahih al-Bukhari · Book 78: Good Manners and Form (Al-Adab) · The name which is most disliked by Allah.
Narrated Abu Huraira:
حَدَّثَنَا أَبُو الْيَمَانِ ، أَخْبَرَنَا شُعَيْبٌ ، حَدَّثَنَا أَبُو الزِّنَادِ ، عَنِ الأَعْرَجِ ، عَنْ أَبِي هُرَيْرَةَ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَخْنَى الأَسْمَاءِ يَوْمَ الْقِيَامَةِ عِنْدَ اللَّهِ رَجُلٌ تَسَمَّى مَلِكَ الأَمْلاَكِ " .
Allah's Messenger (ﷺ) said, "The most awful name in Allah's sight on the Day of Resurrection, will be (that of) a man calling himself Malik Al-Amlak (the king of kings).