Immediately Jesus made the disciples get into the boat and go on ahead of Him to the other side, while He dismissed the crowd. After He had dismissed them, He went up on a mountainside by Himself to pray. When evening came He was there alone but the boat was already a considerable distance from land, buffeted by the waves because the wind was against it. During the 4th watch of the night Jesus went out to them, walking on the lake. When the disciples saw Him walking on the lake they were terrified. "It's a ghost they said, and cried out in fear. But Jesus immediately said to them, "Take courage. It is I. Don't be afraid."(Matt 14:22-27)
14When she recognized Peter's voice, she was so overjoyed she ran back without opening it and exclaimed, "Peter is at the door!"
15"You're out of your mind," they told her. When she kept insisting that it was so, they said, "It must be his angel."
16But Peter kept on knocking, and when they opened the door and saw him, they were astonished. NIV
(Acts 12)
The last one is sometimes made to suggest a guadian angel but the voice was that of Peter making that conslusion unlikely. In both instances the NT depicts the Christians as believing in Ghosts/spirits of the death.
