The misunderstood saying about the beloved disciple.
20. Following] viz. in a literal sense. Our Lord, during His conversation with Peter, had walked to a little distance from the others. Peter, happening to turn round, sees John following: 21. What shall this man do?] i.e. Shall he also die a glorious martyr's death? Seeing that our Lord rebukes the question, there was probably in it some latent jealousy, or, at least, presumption.
Related Commentaries of John 21:20
John 21:20-23
20 Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?
21 Peter seeing him saith to Jesus, Lord, and what shall this man do?
22 Jesus saith unto him, If I will that he tarry till I come, what is that to thee? follow thou me.
23 Then went this saying abroad among the brethren, that that disciple should not die: yet Jesus said not unto him, He shall not die; but,If I will that he tarry till I come, what is that to thee?