When therefore they had rowed about twenty-five or thirty stadia,{25 to 30 stadia is about 5 to 6 kilometers or about 3 to 4 miles} they saw Jesus walking on the sea, and drawing near to the boat; and they were afraid.

 6:28-29 They said to him: "What are we to do to work the works of God?" Jesus answered: "This is the work of God, to believe in him whom he has sent." 