Because of this, the rumor spread among the brothers that this disciple would not die. However, Jesus did not say that he would not die, but only, “If I want him to remain until I return, what is that to you?”
23. Then this saying went forth. The Evangelist relates that, from misunderstanding Christ’s words, an error arose among the disciples, that John would never die. He means those who were present at that conversation, that is, the Apostles; not that the name brethren belongs to them alone, but that they were the first-fruits, as it were, of that holy union.
In these verses, we have, I. The conference Christ had with Peter concerning John, the beloved disciple, in which we have, 1. The eye Peter cast upon him (Joh 21:20): Peter, in obedience to his Master's orders, followed him, and turning about, pleased with the honours his Master now did him, he sees the disciple whom Jesus loved following likewise. Observe here, (1.) How John is described.
Commenting on John 21:20-25
Then went this saying abroad among the brethren,.... It not being rightly understood by some one or more of the disciples present: it was divulged with a wrong sense annexed to it among other persons; who, though not of the eleven, yet were followers of Christ, children of God, that belonged to the same family, and were, in a spiritual relation, brethren to each other...