Matthew 14:29-31

And he said, "Come." And Peter, descending from the boat, walked over the water, so as to go to Jesus. Yet truly, seeing that the wind was strong, he was afraid. And as he began to sink, he cried out, saying: "Lord, save me." And immediately Jesus extended his hand and took hold of him. And he said to him, "O little in faith, why did you doubt?"