Matthew
14:28-31 And Peter answered him and said, Lord, if it be thou, bid me come unto thee on the water. And he said, Come. And when Peter was come down out of the ship, he walked on the water, to go to Jesus. But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me. And immediately Jesus stretched forth [his] hand, and caught him, and said unto him, O thou of little faith, wherefore didst thou doubt?
Mark
9:23, 24 Jesus said unto him, If thou canst believe, all things [are] possible to him that believeth. And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.