Moses speaks boldly to Pharaoh; he is not afraid of Pharaoh (Hebrews 11:27). He trusts in God and is full of the Spirit (Numbers 11:17). He is no longer afraid.
This was the same with Jesus’ disciples. They fell asleep when Jesus wrestled in Gethsemane; they did not understand his spiritual battle. They fled when he was arrested, and they were afraid on the day of the resurrection. But Jesus explained to them the meaning of his suffering and resurrection from the Old Testament (Luke 24:44–46). The disciples rejoiced and praised God (Luke 24:52–53). From Pentecost onward, they were full of the Spirit and could speak boldly. Not only the disciples (Acts 4:8, Acts 4:13) but also the other Christians (Acts 4:31). Paul can therefore write: For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes
(Romans 1:16). Evangelizing is calling to repentance and obedience (Exodus 5:1) and at the same time telling why (Exodus 5:3). Paul writes in 2 Timothy 2:24, 2 Timothy 2:26: And the Lord’s servant must be...correcting his opponents with gentleness. God may perhaps grant them repentance leading to a knowledge of the truth, and they may come to their senses and escape from the snare of the devil, after being captured by him to do his will.
1 Afterward Moses and Aaron went and said to Pharaoh, “Thus says the LORD, the God of Israel, ‘Let my people go, that they may hold a feast to me in the wilderness.’”