When you have to speak and you are afraid
Mūsā ﷺ asked for this before standing in front of Pharaoh.
قَالَ رَبِّ ٱشْرَحْ لِى صَدْرِى وَيَسِّرْ لِىٓ أَمْرِى وَٱحْلُلْ عُقْدَةً مِّن لِّسَانِى يَفْقَهُوا۟ قَوْلِى
Rabbi-shraḥ lī ṣadrī, wa yassir lī amrī, wa-ḥlul ʿuqdatan min lisānī, yafqahū qawlī.
“[Moses] said, "My Lord, expand [i.e., relax] for me my breast [with assurance] And ease for me my task And untie the knot from my tongue That they may understand my speech.”
Source
The Qur'an · 20:25-28
Qur'an
- Qur'anic text in the Uthmani script via Quran.com; translation: Saheeh International