Exodus 14:13-14, 22

Moses said to the people, “Don’t be afraid. Stand still, and see the salvation of the LORD, which he will work for you today; for you will never again see the Egyptians whom you have seen today. The LORD will fight for you, and you shall be still.” The children of Israel went into the middle of the sea on the dry ground; and the waters were a wall to them on their right hand and on their left.