﴿ وَلَقَدْ أَرْسَلْنَا مُوسَىٰ بِـَٔايَٰتِنَآ إِلَىٰ فِرْعَوْنَ وَمَلَإِي۟هِۦ فَقَالَ إِنِّى رَسُولُ رَبِّ ٱلْعَٰلَمِينَ ﴾

“THUS, INDEED, have We sent Moses with Our messages unto Pharaoh and his great ones; and he said: “Behold, I am an apostle of the Sustainer of all the worlds!””

Please check ayah 43:50 for complete tafsir.