…the boat was already a considerable distance from the land, buffeted by the waves because the wind was against it.
During the fourth 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.”
“Lord, if it’s you,” Peter replied, “tell me to come to you on the water.”
“Come,” he said.
Then Peter got down out of the boat, walked on the water and came toward Jesus. But when he saw the wind, he was afraid and, beginning to sink, cried out, “Lord, save me!”
Immediately Jesus reached out his hand and caught him. “You of little faith,” he said, “why did you doubt?” (Matthew 14:24-31 NIV)