Mark 6:48-50

48And seeing them distressed in rowing, for the wind was contrary unto them, about the fourth watch of the night he cometh unto them, walking on the sea; and he would have passed by them:

49but they, when they saw him walking on the sea, supposed that it was an apparition, and cried out:

50for they all saw him, and were troubled. But he straightway spake with them, and saith unto them, Be of good cheer: it is I; be not afraid.