Jesus fed five thousand people, and then sent them back to home. He let his disciples go into a boat and go across the water, and then he went up the mountain, by himself, praying to God, until the sun was set. 

As night came on, the boat away from the land kept stirring around, owing to roaring windstorms. His disciples were terrified, when someone was walking on the dark water. 

John cried out. 

"It is a ghost!" 

Then, they heard Jesus' voice. 

"Dont be afraid. It is me." 

Peter cried out. 

"Lord, If you are really Jesus, let me walk on the water, too, please." 

Jesus said. 

"You can walk." 

Peter got out of the boat and walked, step by step, looking at Jesus. But the moment he saw the roaring waves, he was terrified and fell into water. 

"Oh, Lord~ Rescue me out of the water!" 

Then, Jesus reached his hand out to Peter and held his arms. 

"What little faith! Why do you doubt"? 

When Jesus was into the boat, the windstorms stopped, immediately. His disciples in the boat knew certainly that he was the son of God. 

(Matthew 14:22-33, Mark 6:45-52, John 6:16-21)