John 21:22-23 Jesus answered, "If I want him to remain alive until I return, what is that to you? You must follow me." Because of this, the rumor spread among the brothers that this disciple would not die. But Jesus did not say that he would not die; he only said, "If I want him to remain alive until I return, what is that to you?"
Listen to rumors much? Jesus was basically telling Peter to mind his own business.