“And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.”
King James Version (KJV)
Mt 14:26 A spirit. An apparition, an unreal appearance of a real person. The Greek word "phantasma" is not that unusually rendered "spirit". He would appear to them at first like a dark, moving speck upon the waters, then as a human figure; but in the dark, tempestuous sky, and not dreaming that it could be their Lord, they take it for a spirit, "pneuma" (Lu 24:37). Cried out. In fright.