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."
Cross References (ranked by relevance)
And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last:
Then opened he their understanding, that they might understand the scriptures,
And they said unto her, Thou art mad. But she constantly affirmed that it was even so. Then said they, It is his angel.
But they were terrified and affrighted, and supposed that they had seen a spirit.
And as they were afraid, and bowed down their faces to the earth, they said unto them, Why seek ye the living among the dead?