Mark 6:48
He could see that the disciples were straining to row, because the wind was against them. About the fourth watch of the night, Jesus went out to them, walking on the sea. He intended to pass by them,

Mark 6:50
for they all saw Him and were terrified. But Jesus spoke up at once: "Take courage! It is I. Do not be afraid."

Luke 24:37
But they were startled and frightened, thinking they had seen a spirit.