Mark 6:49

49 but they, when they saw him walking on the sea, supposed that it was a ghost, and cried out;

Mark 6:49 In-Context

47 When evening had come, the boat was in the midst of the sea, and he was alone on the land.
48 Seeing them distressed in rowing, for the wind was contrary to them; and about the fourth watch of the night he came to them, walking on the sea, and he would have passed by them,
49 but they, when they saw him walking on the sea, supposed that it was a ghost, and cried out;
50 for they all saw him, and were troubled. But he immediately spoke with them, and said to them, "Cheer up! It is I! Don't be afraid."
51 He went up to them into the boat; and the wind ceased, and they were very amazed among themselves, and marveled;
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