NET
26 When the disciples saw him walking on the water they were terrified and said, “It’s a ghost!” and cried out with fear.
Darby
26 And the disciples, seeing him walking on the sea, were troubled, saying, It is an apparition. And they cried out through fear.
KJV
26 And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.