Then went this saying ... - This mistake arose very naturally:

1. From the words of Jesus, which might be easily misunderstood to mean that he should not die; and,

2. It was probably confirmed when it was seen that John survived all the other apostles, had escaped all the dangers of persecution, and was leading a peaceful life at Ephesus. This mistake John deemed it proper to correct before he died, and has thus left on record what Jesus said and what he meant.

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, and to the apostles:

that that disciple should not die; but should remain till the second coming of Christ, and be found among them that shall be then alive, and be changed. And such a notion not only was among the ancients; but Beza, in his notes on this text, tells us of a strolling wicked fellow, that gave out that he was the Apostle John; and was encouraged by some, particularly Postellus, a Sorbonic doctor, but was afterwards burnt at Tholouse.

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? These are the words of John himself, the disciple spoken of, who gives a true and just account of Christ's words, freeing them from the false sense that was put upon them; which shows his ingenuous disposition, his integrity and love of truth; being unwilling that such an error should obtain among the disciples, and pass in the world for truth.

Should not die (οὐκ ἀποθνήσκει)

Literally, dieth not.

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?

21:23 This saying went abroad. At the time John wrote these words he did not understand just what the saying might mean.

21:23 The brethren - That is, the Christians. Our Lord himself taught them that appellation, John 20:17. Yet Jesus did not say to him, that he should not die - Not expressly. And St. John himself, at the time of writing his Gospel, seems not to have known clearly, whether he should die or not.

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.

21:20-24 Sufferings, pains, and death, will appear formidable even to the experienced Christian; but in the hope to glorify God, to leave a sinful world, and to be present with his Lord, he becomes ready to obey the Redeemer's call, and to follow Him through death to glory. It is the will of Christ that his disciples should mind their own duty, and not be curious about future events, either as to themselves or others. Many things we are apt to be anxious about, which are nothing to us. Other people's affairs are nothing to us, to intermeddle in; we must quietly work, and mind our own business. Many curious questions are put about the counsels of God, and the state of the unseen world, as to which we may say, What is this to us? And if we attend to the duty of following Christ, we shall find neither heart nor time to meddle with that which does not belong to us. How little are any unwritten traditions to be relied upon! Let the Scripture be its own interpreter, and explain itself; as it is, in a great measure, its own evidence, and proves itself, for it is light. See the easy setting right such mistakes by the word of Christ. Scripture language is the safest channel for Scripture truth; the words which the Holy Ghost teaches, 1Co 2:13. Those who cannot agree in the same terms of art, and the application of them, may yet agree in the same Scripture terms, and to love one another.