Mark 6:49

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

Mark 6:49 In-Context

47 And when evening came, the boat was out on the sea, and he was alone on the land.
48 And he saw that they were making headway painfully, for the wind was against them. And about the fourth watch of the night he came to them, walking on the sea. He meant to pass by them,
49 but when they saw him walking on the sea they thought it was a ghost, and cried out;
50 for they all saw him, and were terrified. But immediately he spoke to them and said, "Take heart, it is I; have no fear."
51 And he got into the boat with them and the wind ceased. And they were utterly astounded,
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.