John 21:23

Then went this saying abroad among the brethren, that that disciple should not die--into which they the more easily fell from the prevalent expectation that Christ's second coming was then near at hand. yet Jesus said not unto him, He shall not die--The Evangelist is jealous for His Master's honor, which his death might be thought to compromise if such a misunderstanding should not be corrected.

The evangelist seemed to have concluded his history with the foregoing chapter; but (as St. Paul sometimes in his epistles), new matter occurring, he begins again. He had said that there were many other signs which Jesus did for the proof of his resurrection. And in this chapter he mentions one of these many, which was Christ's appearance to some of his disciples at the sea of Tiberias, in which we have an account, I. How he discovered himself to them as they were fishing, filled their net, and then very familiarly came and dined with them upon what they had caught (Joh 21:1-14). II. What discourse he had with Peter after dinner, 1. Concerning himself (Joh 21:15-19). 2. Concerning John (Joh 21:20-23). III. The solemn conclusion of this gospel (Joh 21:24, Joh 21:25). It is strange that any should suppose that this chapter was added by some other hand, when it is expressly said (Joh 21:24) that the disciple whom Jesus loved is he which testifieth of these things.

21:23 Jesus’ words to Peter spread, causing some to conclude that John would not die until Jesus returned in his second coming. Jesus’ rebuke to Peter (21:22) is repeated to answer that rumor. Those among the community of believers who believed this rumor were thus instructed to abandon any speculation about John. According to tradition, John died peacefully in Ephesus at an old age, surrounded by fellow believers.