Moses did not need to be afraid. He was sent by Jehovah, who would give Moses whatever he needed to deliver God’s message to Pharaoh.
وَيَتَّضِحُ ذٰلِكَ مِنَ ٱلسُؤَالِ ٱلَّذِي سَبَقَ أَنْ طَرَحَهُ عَلَى يَهْوَهَ :‏ « مَنْ أَنَا حَتَّى أَذْهَبَ إِلَى فِرْعَوْنَ ،‏ وَحَتَّى أُخْرِجَ بَنِي إِسْرَائِيلَ مِنْ مِصْرَ ؟‏ » .‏