Exodus 14:4, 10, 31

And I will harden Pharaoh’s heart, and he shall follow after them; and I will get me honor upon Pharaoh, and upon all his host: and the Egyptians shall know that I am Jehovah. And they did so.

And when Pharaoh drew nigh, the children of Israel lifted up their eyes, and, behold, the Egyptians were marching after them; and they were sore afraid: and the children of Israel cried out unto Jehovah.

And Israel saw the great work which Jehovah did upon the Egyptians, and the people feared Jehovah: and they believed in Jehovah, and in his servant Moses.