John 6:16-20

And when even was now come, his disciples went down unto the sea,

And entered into a ship, and went over the sea toward Capernaum. And it was now dark, and Jesus was not come to them.

And the sea arose by reason of a great wind that blew.

So when they had rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and drawing nigh unto the ship: and they were afraid.

But he saith unto them, It is I; be not afraid.