21:20-22 “What about him, Lord?” Peter asked Jesus about the fate of John, wondering if he, too, would experience martyrdom. Jesus’ answer was abrupt: It was not Peter’s business to know how or when John would die. Peter’s only task was to follow Jesus, which John was already doing. This episode forms the core of John’s concept of discipleship: What matters most for the disciple of Jesus is to follow him and do his will, come what may.