Surah Ash-Shu'ara — Ayah 11

وَإِنَّ رَبَّكَ لَهُوَ ٱلْعَزِيزُ ٱلرَّحِيمُ

And indeed, your Lord - He is the Exalted in Might, the Merciful.

وَإِذْ نَادَىٰ رَبُّكَ مُوسَىٰٓ أَنِ ٱئْتِ ٱلْقَوْمَ ٱلظَّـٰلِمِينَ

And [mention] when your Lord called Moses, [saying], "Go to the wrongdoing people -

قَالَ رَبِّ إِنِّىٓ أَخَافُ أَن يُكَذِّبُونِ

He said, "My Lord, indeed I fear that they will deny me

وَيَضِيقُ صَدْرِى وَلَا يَنطَلِقُ لِسَانِى فَأَرْسِلْ إِلَىٰ هَـٰرُونَ

And that my breast will tighten and my tongue will not be fluent, so send for Aaron.