King James Version (KJV)

Matthew 14:26

“And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.”

Verse in context — Matthew 14

But the ship was now in the midst of the sea, tossed with waves: for the wind was contrary.

And in the fourth watch of the night Jesus went unto them, walking on the sea.

And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.

But straightway Jesus spake unto them, saying, ‹Be of good cheer; it is I; be not afraid.›

And Peter answered him and said, Lord, if it be thou, bid me come unto thee on the water.

Jesus as the promised Messiah, fulfilling Old Testament prophecy.