On the next day, the multitude that stood on the other side of the sea saw that there was no other boat there, except the one in which his disciples had embarked, and that Jesus hadn't entered with his disciples into the boat, but his disciples had gone away alone.
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 )