And Moses said unto the people, Fear ye not, stand still, and see the salvation of the Lord, which he will shew to you to day: for the Egyptians whom ye have seen to day, ye shall see them again no more for ever. The Lord shall fight for you, and ye shall hold your peace. Exodus 14:13-14 (KJV)
"The people" whom Moses addresses are Israel as they were fleeing Egypt. He is using the very name of the people, Israel, to exhort them to trust in God who "will fight for them."
In Genesis 32 we read the story of Jacob wrestling with God and after the night-long contention God gives Jacob a new name, Israel. Israel: God contends; perseveres. God prevails.
Then the Psalmist reminds us again to "Be still and know that I am God." (42:10)
Fear is an adjunct of self-reliance. In trusting God we have nothing to fear.