Tafsir of Al-Mu'minoon 23:116

فتعالى الله الملك الحق

So Exalted be Allah, the True King. means, sanctified be He above the idea that he should create anything in vain, for He is the True King Who is far above doing such a thing.

ﻻ إله إﻻ هو رب العرش الكريم

None has the right to be worshipped but He, the Lord of Al-`Arsh Al-Karim! The Throne is mentioned because it is the highest point of all creation, and it is described as Karim, meaning beautiful in appearance and splendid in form, as Allah says elsewhere:

أنبتنا فيها من كل زوج كريم

every good kind We cause to grow therein. (26:7)