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?
Or let him say, Christ did not deny that John was to die, for whatever is born dies; but said, I will that he tarry till I come, i. e. to live to the end of the world, and then he shall suffer martyrdom for Me. And therefore they confess that he still lives, but will be killed by Antichrist, and will preach Christ’s name with Elias. But if his sepulchre be objected, then they say that he entered in alive, and went out of it afterwards.