رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1724
The Book of the Prohibited actions
Prohibition of Addressing somebody as 'The King of Kings'
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ النَّبِيِّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: إِنَّ أَخْنَعُ اسْمٍ عِنْدَ اللَّهِ عز وجل رَجُلٌ تَسَمَّى مَلِكَ الأَمْلاَكِ ((مُتَّفَقٌ عَلَيْهِ)). قَالَ سُفْيَانُ بْنُ عُيَيْنَةَ: «مَلِكُ الأَمْلاَكِ» مِثْلُ: شَاهِن شَاهِ.
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].
Riyad as-Salihin, 1724