(114) باب أَبْغَضِ الأَسْمَاءِ إِلَى اللَّهِ
Narrated Abu Huraira:
The Prophet (ﷺ) said, "The most awful (meanest) name in Allah's sight." Sufyan said more than once, "The most awful (meanest) name in Allah's sight is (that of) a man calling himself king of kings." Sufyan said, "Somebody else (i.e. other than Abu Az-Zinad, a sub-narrator) says: What is meant by 'The king of kings' is 'Shahan Shah.,"
Reference: Sahih al-Bukhari 6206
In-book reference: Book 78, Hadith 230
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 225