Dua of Musa — Rabbi ishrah li sadri
رَبِّ اشْرَحْ لِي صَدْرِي وَيَسِّرْ لِي أَمْرِي وَاحْلُلْ عُقْدَةً مِنْ لِسَانِي يَفْقَهُوا قَوْلِي
“My Lord, expand for me my chest, ease my task for me, and untie the knot from my tongue so they may understand my speech.”
Quran 20:25-28 — Ta-Ha