Abu Hurairah (May Allah be pleased with him) said:
The Prophet ﷺ said, "The most disgraceful man near Allah is a man who calls himself (or likes others to call him) Malikul-Amlak (i.e., king of kings)."

[Al-Bukhari and Muslim].

وعن أبي هريرة رضي الله عنه النبي ﷺ قال: "إن أخنع اسم عند الله عز وجل رجل تسمى ملك الأملاك" ((متفق عليه)).