Theophylact of Ohrid
Catena Aurea · Johannesevangelium 21
And when he had spoken this, he saith unto him, Follow me. 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? Peter seeing him saith to Jesus, Lord, and what shall this man do? Jesus saith unto him, If I will that he tarry till I come, what is that to thee? follow thou me. 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?
Some have understood, Till I come, to mean, Till I come to punish the Jews who have crucified Me, and strike them with the Roman rod. For they say that this Apostle lived up to the time of Vespasian, who took Jerusalem, and dwelt near when it was taken. Or, Till I come, i. e. till I give him the commission to preach, for to you I commit now the pontificate of the world: and in this follow Me, but let him remain till I come and call him, as I do thee now.