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.
Now many therefore of his disciples, when they heard this, said, [Man,] These are tough sayings; who can hear it? And when Jesus knew in himself that his disciples murmured at it, he said unto them, Does this offend you? What and if you will see the Son of man ascending up where he was before? ( John 6:60-62 )