The Holy Quran 7:122 — Surah Al-A'raf
Arabic text
رَبِّ مُوسَىٰ وَهَـٰرُونَ
Translation
"...the Rabb of Moosa عليه الصلاة والسلام and Haroon عليه الصلاة والسلام (contrary to what Fir'oun wanted them to believe, that he was their "High Lord")."
Tafsir (excerpt) — Tafsir Usmani
Since Pharaoh too used to say of himself انا ربکم الاعلیٰ “I am your lord most high,” perhaps that is why, together with رَبِّ الْعٰلَمِيْنَ “the Lord of the worlds,” it was necessary to say رَبِّ مُوْسٰى وَ هٰرُوْنَ “the Lord of Musa and Harun.
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