The Holy Quran 26:13 — Surah Ash-Shu'ara
Arabic text
وَيَضِيقُ صَدْرِى وَلَا يَنطَلِقُ لِسَانِى فَأَرْسِلْ إِلَىٰ هَـٰرُونَ
Translation
"And (I fear that out of anxiety) my chest would tighten and that my tongue will not be able to move (not be articulate). So send for Haaroon عليه الصلاة والسلام (allow him to assist me in my task)."
Tafsir (excerpt) — Tafsir Usmani
The request to make Harun ﵇ his deputy: that is, they will start calling me a liar before hearing me out, and in the assembly there will be no one to support me. It may be that, grieved and saddened at that moment, my heart will be constricted and will not open up, and there is already some impediment in my tongue.
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