Surah Taha, verse 26

ٱذْهَبْ إِلَىٰ فِرْعَوْنَ إِنَّهُۥ طَغَىٰ ﴿٢٤﴾

Go to Pharaoh. Indeed, he has transgressed [i.e., tyrannized]."

قَالَ رَبِّ ٱشْرَحْ لِى صَدْرِى ﴿٢٥﴾

[Moses] said, "My Lord, expand [i.e., relax] for me my breast [with assurance]

وَٱحْلُلْ عُقْدَةًۭ مِّن لِّسَانِى ﴿٢٧﴾

And untie the knot from my tongue

يَفْقَهُوا۟ قَوْلِى ﴿٢٨﴾

That they may understand my speech.