When the disciples saw him walking on the lake, they were terrified. "It's a ghost,"1 they said, and cried out in fear.
References for Matthew 14:26
But Jesus immediately said to them: "Take courage!2 It is I. Don't be afraid."3
References for Matthew 14:27
"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,"4 he said, "why did you doubt?"
References for Matthew 14:31
And when they climbed into the boat, the wind died down.