Mark 6:46-50

And when he had sent them away, he departed into a mountain to pray.

And when even was come, the ship was in the midst of the sea, and he alone on the land.

And he saw them toiling in rowing; for the wind was contrary unto them: and about the fourth watch of the night he cometh unto them, walking upon the sea, and would have passed by them.

But when they saw him walking upon the sea, they supposed it had been a spirit, and cried out:

For they all saw him, and were troubled. And immediately he talked with them, and saith unto them, Be of good cheer: it is I; be not afraid.