Mark 6:48-50

And seeing that they had trouble in getting their boat through the water, because the wind was against them, about the fourth watch of the night he came to them, walking on the sea; and he would have gone past them; But they, when they saw him walking on the sea, took him for a spirit, and gave a loud cry: For they all saw him, and were troubled. But straight away he said to them, Take heart, it is I, have no fear.