Quran 3:26 – Shahdah-Alan-Nas And Badshahi
If shahadat alan naas is referred to as بادشاہی , then individually we all are to testify that there is no God but Him. Will the word بادشاہی refer to every human being?
What about the word بادشاہی؟ Will it apply to each individual who beats witness on the oneness of God?
The language itself determines whether an expression is used as metaphor or not. In this verse there is no such context to claim that this is metaphor. This is about establishment a great empire, which actually happened.