The Lord is my strength and song and He has become my salvation. Exodus 15:2
“Yes,” say some, “but God has appointed another way: ‘Stand still ad see that salvation of God.’” Let us examine the Scriptures t which you refer.
The first of them, with the context, runs thus:
“10 As Pharaoh approached, the Israelites looked up and saw the Egyptians marching after them, and they were very frightened; so the Israelites cried out to the Lord. 11 Then they said to Moses, “Is it because there are no graves in Egypt that you have taken us away to die in the wilderness? What is this that you have done to us by bringing us out of Egypt? 12 Did we not say to you in Egypt, ‘Leave us alone; let us serve the Egyptians?’ For it would have been better for us to serve the Egyptians [as slaves] than to die in the wilderness.”
The Sea Is Divided
13 Then Moses said to the people, “Do not be afraid! Take your stand [be firm and confident and undismayed] and see the salvation of theLord which He will accomplish for you today; for those Egyptians whom you have seen today, you will never see again. 14 The Lord will fight for you while you [only need to] keep silent and remain calm.”
15 The Lord said to Moses, “Why do you cry to Me? Tell the sons of Israel to move forward [toward the sea]. 16 As for you, lift up your staff and stretch out your hand over the sea and divide it, so that the sons of Israel may go through the middle of the sea on dry land.” Exodus 14:10-16
This was the salvation of God, which they stood still to see, by marching forward with all their might!
So let us believe God and follow his commands, waiting on him in His way, using the means of grace He has appointed.