﴿ ۞ وَقَالَ ٱللَّهُ لَا تَتَّخِذُوٓا۟ إِلَٰهَيْنِ ٱثْنَيْنِ ۖ إِنَّمَا هُوَ إِلَٰهٌۭ وَٰحِدٌۭ ۖ فَإِيَّٰىَ فَٱرْهَبُونِ ﴾

“And God has said: "Do not take to worshipping two [or more] deities. He is the One and Only God: hence, of Me, of Me alone stand in awe!"”

And God has said ‘Do not choose two gods ithnayn is for emphasis. Truly there is only One God — He has added this statement to affirm His Divinity and Oneness — so be in awe of Me alone’ fear Me to the exclusion of anyone else — herein is a shift from the third person to the first.