Dua before public speaking

ربي اِشرَح لي صَدري و يَسِّر لي امري وأحلل عُقْدَةَ مِن لِساني يفقهوا قَوْلي

Rabbi Ashreh Lee Sadri Wa Yasir Li Amri Wa Ahlul Oqdatan min Lisaani Yafqahou Qawlie.

O my Lord, Open my heart, make my task easy for me and remove the knot from my tongue, so they may understand my speech