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
This great declaration occurs as the children of Israel are standing with the sea in front of them and the armies of Pharaoh pursuing them from behind. Their response is to remind Moses how they never wanted to leave, they told him he brought them out here to die. What a faithless response. They were "sore afraid". Fear has torment, it will cause someone to be irrational, to get carried away with false understanding. But God, and in this case his man Moses, step up. Moses believed, and God performed.
We see a similar story when Jehoshaphat stood facing the Moabites and the Ammonites in 2Chr 20 and he declared the salvation of God.
Ye shall not need to fight in this battle: set yourselves, stand ye still, and see the salvation of the Lord with you, O Judah and Jerusalem: fear not, nor be dismayed; to morrow go out against them: for the Lord will be with you. 2Chr 20:17
It is the Lord who stands ready to fight for us, to deliver us, even as He did Israel over and over again; when they repented and called upon the name of their God. When they would put their fear aside and trust Him.
Isaiah declares (chapter 52) the salvation of God in the face of numerous oppressions, just before the description of the servant of God who comes to suffer and be rejected, beaten and killed. As we know, Jesus, the lamb of God who takes away the sin of the world.
John the baptist testified of this, the lamb of God. He also declared in Luke 3:4-6
As it is written in the book of the words of Esaias the prophet, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. Every valley shall be filled, and every mountain and hill shall be brought low; and the crooked shall be made straight, and the rough ways shall be made smooth; And all flesh shall see the salvation of God.
The salvation of God has come. Not wrought by man, but performed by God. The Father sent his son, Jesus, who tasted of death for every man, that whosoever would believe on him would not perish, but have everlasting life.
Hear the word of Jesus, Mark 5:36b, Be not afraid, only believe.